Denver Broncos quarterback Peyton Manning throws a pass during practice at NFL football minicamp at the team's training facility Thursday, June 13, 2013, in Englewood, Colo. (AP Photo/Ed Andrieski)

Minnesota Vikings running back Adrian Peterson (28) eyes a soccer ball throw to him during drills in the Vikings' NFL football mini-camp, Thursday, June 20, 2013, in Eden Prairie, Minn. (AP Photo/Jim Mone)

Baltimore Ravens guard/tackles Kelechi Osemele, left, and Jack Cornell run a drill during an NFL football practice at the team's practice facility in Owings Mills, Md., Thursday, June 13, 2013. (AP Photo/Patrick Semansky)

New England Patriots quarterback Tim Tebow throws during a team football practice in Foxborough, Mass., Tuesday June 11, 2013. (AP Photo/Charles Krupa)

Miami Dolphins defensive back De'Andre Patterson (23) out jumps Chris Clemons (30) to catch a pass during NFL football minicamp Thursday, June 13, 2013, at the team?s training facility in Davie, Fla. (AP Photo/J Pat Carter)

Minnesota Vikings running back Adrian Peterson (28) awaits a pass during the Vikings' NFL football mini-camp, Thursday, June 20, 2013, in Eden Prairie, Minn. (AP Photo/Jim Mone)

Baltimore Ravens quarterback Joe Flacco throws a pass during an NFL football practice at the team's practice facility in Owings Mills, Md., Thursday, June 13, 2013. (AP Photo/Patrick Semansky)

Denver Broncos running backs Jeremiah Johnson, left, and Montee Ball practice blocking drills during practice at NFL football minicamp at the team's training facility Thursday, June 13, 2013, in Englewood, Colo. (AP Photo/Ed Andrieski)

Detroit Lions wide receiver Calvin Johnson catches a ball during a NFL football minicamp in Allen Park, Mich., Thursday, June 13, 2013. (AP Photo/Paul Sancya)

Buffalo Bills' Aaron Williams (23) talks with Da'Norris Searcy (25) during NFL football minicamp in Orchard Park, N.Y., Thursday, June 13, 2013. With Jairus Byrd still unsigned, Williams has become Plan B for the Bills when it comes to filling a big hole in their defensive backfield. (AP Photo/David Duprey)

Carolina Panthers quarterback Cam Newton shares a laugh with teammates during the NFL football team's minicamp practice in Charlotte, N.C., Thursday, June 13, 2013. Newton and coach Ron Rivera feel the Panthers need to get their running backs more involved in the offense this year. (AP Photo/Chuck Burton)

Detroit Lions running back Reggie Bush runs a drill during an NFL football minicamp practice in Allen Park, Mich., Thursday, June 13, 2013. (AP Photo/Paul Sancya)

Detroit Lions quarterback Matthew Stafford (9) runs with teammates during practice at NFL football minicamp in Allen Park, Mich., Wednesday, June 12, 2013. (AP Photo/Paul Sancya)

New York Jets quarterback Geno Smith (7) throws a pass during an NFL football minicamp Thursday, June 13, 2013, in Florham Park, N.J. (AP Photo/Mel Evans)

New York Jets wide receiver Stephen Hill (84) tries to hold on to a pass from quarterback Greg McElroy during an NFL football minicamp Thursday, June 13, 2013, in Florham Park, N.J. (AP Photo/Mel Evans)

Cincinnati Bengals tight end Orson Charles jumps over a blocking pad thrown at him during the NFL football team's mandatory mini-camp, Thursday, June 13, 2013, in Cincinnati. (AP Photo/Al Behrman)

Miami Dolphins defensive end Cameron Wake (91) runs a series of drills during NFL football minicamp Thursday, June 13, 2013, at the team?s training facility in Davie, Fla. (AP Photo/J Pat Carter)

Washington Redskins' quarterback Robert Griffin III throws during NFL football minicamp at Redskins Park, Wednesday, June 12, 2013, in Ashburn, Va. Quarterback Kirk Cousins stands at rear left. (AP Photo/Carolyn Kaster)

Chicago Bears quarterback Jay Cutler (6) looks to a pass during an NFL football minicamp Thursday, June 13, 2013, in Lake Forest, Ill. (AP Photo/Nam Y. Huh)

Chicago Bears' Nate Collins (93) works with teammates during an NFL football minicamp on Thursday, June 13, 2013, in Lake Forest, Ill. (AP Photo/Nam Y. Huh)

Oakland Raiders running back Darren McFadden, right, runs a drill with quarterback Tyler Wilson during practice at NFL football minicamp in Alameda, Calif., Thursday, June 13, 2013. (AP Photo/Jeff Chiu)

Detroit Lions defensive tackle Ndamukong Suh runs a drill during NFL football minicamp practice in Allen Park, Mich., Wednesday, June 12, 2013. (AP Photo/Paul Sancya)

Houston Texans running back Cierre Wood catches a pass during NFL football minicamp, Wednesday, June 12, 2013, in Houston. (AP Photo/Bob Levey)

Arizona Cardinals' Darnell Dockett with his new face mask. (AP Photo/Matt York)

Miami Dolphins running backs Evan Rodriguez, foreground and Marcus Thigpen, rear, run drills during NFL football minicamp, Wednesday, June 12, 2013 at the team's training facility in Davie, Fla. (AP Photo/Wilfredo Lee)

Oakland Raiders defensive back Charles Woodson catches a ball during practice at NFL football minicamp in Alameda, Calif., Thursday, June 13, 2013. (AP Photo/Jeff Chiu)

New England Patriots quarterback Tim Tebow points to a receiver as he drops back on a passing route as offensive coordinator Josh McDaniels, left, looks on during NFL football practice in Foxborough, Mass., Tuesday June 11, 2013. (AP Photo/Charles Krupa)

New England Patriots quarterback Tim Tebow, center, tosses the ball as Tom Brady, left, talks with offensive coordinator Josh McDaniels during a team football practice in Foxborough, Mass., Tuesday June 11, 2013. (AP Photo/Charles Krupa)

Detroit Lions defensive backs run a drill during NFL football practice in Allen Park, Mich., Tuesday, June 4, 2013. (AP Photo/Paul Sancya)

New England Patriots quarterbacks Tom Brady, right, and Ryan Mallett, left, stretch during a team practice in Foxborough, Mass., Tuesday, June 4, 2013. (AP Photo/Charles Krupa)

Cleveland Browns defensive back Leon McFadden catches passes after minicamp practice at the NFL football team's practice facility in Berea, Ohio Wednesday, June 5, 2013. (AP Photo/Mark Duncan)

Dallas Cowboys center Travis Frederick (70) and offensive tackle Tyron Smith (77) block during an organized team activity (OTA) on Wednesday, June 5, 2013 at the club's headquarters in Irving, Texas. (AP Photo/James D Smith)

Pittsburgh Steelers wide receiver Markus Wheaton, right, reaches for a pass from quarterback Landry Jones, left, during the NFL football practice on Wednesday, June 5, 2013 in Pittsburgh. (AP Photo/Keith Srakocic)

New York Jets quarterback Geno Smith throws a pass during NFL football practice Wednesday, June 5, 2013, in Florham Park, N.J. (AP Photo/Bill Kostroun)

Dallas Cowboys cornerback Morris Claiborne (24) catches a pass as secondary coach Jerome Henderson (right) defends with a pad during an organized team activity (OTA) on Wednesday, June 5, 2013 at the club's headquarters in Irving, Texas. (AP Photo/James D Smith)

Pittsburgh Steelers linebacker LaMarr Woodley (56), foreground, runs with teammates during the NFL football practice on Wednesday, June 5, 2013 in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers head coach Mike Tomlin, center, walks between quarterbacks John Parker Wilson (4) and Bruce Gradkowski (5) as they stretch during NFL football practice on Wednesday, June 5, 2013, in Pittsburgh. (AP Photo/Keith Srakocic)

Minnesota Vikings quarterback Christian Ponder (7) )is shown shown during Organized Team Activities (OTA) workouts for the NFL football team, Wednesday, June 5, 2013 in Eden Prairie, Minn. (AP Photo/Jim Mone)

New Orleans Saints quarterback Drew Brees (9) talks with New Orleans Saints wide receiver Joe Morgan (13) during NFL football practice at the team's training facility in Metairie, La., Wednesday, June 5, 2013. (AP Photo/Bill Haber)

Dallas Cowboys coach Jason Garrett during an organized team activity (OTA) on Wednesday, June 5, 2013 at the club's headquarters in Irving, Texas. (AP Photo/James D Smith)

Arizona Cardinals quarterback Carson Palmer makes a throw during practice at the Cardinals training facility on Tuesday, May 14, 2013, in Tempe, Ariz. (AP Photo/Ross D. Franklin)

Cleveland Browns owner Jimmy Haslam, second from left, watches minicamp practice at the NFL football team's practice facility in Berea, Ohio Wednesday, June 5, 2013. (AP Photo/Mark Duncan)

Minnesota Vikings defensive end Jared Allen signs a jersey for a Special Olympics athlete after NFL football workouts, Wednesday, June 5, 2013 in Eden Prairie, Minn. Though the Vikings are a young team with a promising future, the most prominent player among the veterans is Allen, whose big contract will expire after the season. Allen is recovering from surgery to repair a torn labrum in his left shoulder. (AP Photo/Jim Mone)

Atlanta Falcons head coach Mike Smith, second from right, chats with his players during NFL football practice in Flowery Branch, Ga., Wednesday, June 5, 2013. (AP Photo/John Bazemore)

Buffalo Bills quarterbacks including EJ Manuel (3) throw during an optional NFL workout in Orchard Park, N.Y., Monday, May 20, 2013. (AP Photo/David Duprey)

San Francisco 49ers offensive consultant Eric Mangini, right, watches as quarterback Colin Kaepernick (7) practices at the NFL football team's training camp in Santa Clara, Calif., Tuesday, June 4, 2013. (AP Photo/Jeff Chiu)

New Orleans Saints running back Mark Ingram runs a drill during NFL football practice at the team's training facility in Metairie, La., Wednesday, June 5, 2013. (AP Photo/Bill Haber)

Dallas Cowboys receiver Dez Bryant (88) is hit with pads after a catch during an organized team activity (OTA) on Tuesday, June 4, 2013 at the club's headquarters in Irving, Texas. (AP Photo/James D Smith)

San Francisco 49ers running back Marcus Lattimore throws a football after practice at an NFL football training camp in Santa Clara, Calif., Tuesday, June 4, 2013. (AP Photo/Jeff Chiu)

Cleveland Browns' Davon Bess catches a punt as special teams coordinator Chris Tabor, left, and receivers coach Scot Turner watch during minicamp practice at the NFL football team's practice facility in Berea, Ohio Wednesday, June 5, 2013. (AP Photo/Mark Duncan)

New York Jets quarterback Mark Sanchez (6) throws a pass as offensive coordinator Marty Mornhinweg looks on during NFL football practice Wednesday, June 5, 2013, in Florham Park, N.J. (AP Photo/Bill Kostroun)

Atlanta Falcons defensive end Osi Umenyiora works with an exercise ball during NFL football practice in Flowery Branch, Ga., Wednesday, June 5, 2013. (AP Photo/John Bazemore)

Chicago Bears quarterback Jay Cutler walks off the field after the Bears' NFL football practice Tuesday, June 4, 2013, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

New Orleans Saints coach Sean Payton signs autographs after an NFL football practice at the team's training facility in Metairie, La., Tuesday, June 4, 2013. (AP Photo/Bill Haber)

New Tampa Bay Buccaneers cornerback Darrelle Revis, left, smiles as he talks to Todd Toriscelli, Director of Sports Medicine and Performance, during an optional NFL football workout Tuesday, June 4, 2013, in Tampa, Fla. (AP Photo/Chris O'Meara)

Tampa Bay Buccaneers quarterback Josh Freeman throws a pass during an optional NFL football workout Tuesday, June 4, 2013, in Tampa, Fla. (AP Photo/Chris O'Meara)

New Orleans Saints quarterback Drew Brees (9) throws a pass as offensive cordinator Pete Carmichael looks on during NFL football practice at the team's training facility in Metairie, La., Tuesday, June 4, 2013. (AP Photo/Bill Haber)

Detroit Lions quarterbacks, from left, Kellen Moore, Shaun Hill and Matthew Stafford throw during NFL football practice in Allen Park, Mich., Tuesday, June 4, 2013. (AP Photo/Paul Sancya)

New Orleans Saints linebacker Will Smith (91) signs autographs after an NFL football practice at the team's training facility in Metairie, La., Tuesday, June 4, 2013. (AP Photo/Bill Haber)

Philadelphia Eagles' Felix Jones makes a catch at the team's NFL football training facility, Tuesday, June 4, 2013, in Philadelphia. (AP Photo/Matt Rourke)

New England Patriots wide receiver Danny Amendola keeps his eyes on the ball on a pass play during NFL football practice in Foxborough, Mass., Tuesday, June 4, 2013. (AP Photo/Charles Krupa)

New England Patriots head coach Bill Belichick, left, runs with his players during NFL football practice in Foxborough, Mass., Tuesday, June 4, 2013. (AP Photo/Charles Krupa)

New England Patriots quarterback Tom Brady throws during NFL football practice in Foxborough, Mass., Tuesday, June 4, 2013. (AP Photo/Charles Krupa)

Detroit Lions safety Glover Quin points out coverage during NFL football practice in Allen Park, Mich., Tuesday, June 4, 2013. (AP Photo/Paul Sancya)

New Orleans Saints wide receiver Kenny Stills grabs a pass during NFL football practice at the team's training facility in Metairie, La., Tuesday, June 4, 2013. (AP Photo/Bill Haber)

Tampa Bay Buccaneers safety Mark Barron (23) blocks a punt during an optional NFL football workout Tuesday, June 4, 2013, in Tampa, Fla. (AP Photo/Chris O'Meara)

Tampa Bay Buccaneers wide receiver Vincent Jackson catches a pass during an optional NFL football workout Tuesday, June 4, 2013, in Tampa, Fla. (AP Photo/Chris O'Meara)

Cleveland Browns kicker Shayne Graham (7) kicks a field goal out of the hold of punter T.J. Conley during minicamp practice at the NFL football team's practice facility in Berea, Ohio Tuesday, June 4, 2013. (AP Photo/Mark Duncan)

Cleveland Browns linebacker Paul Kruger (99) runs a drill during minicamp at the NFL football team's practice facility in Berea, Ohio Tuesday, June 4, 2013. (AP Photo/Mark Duncan)

Washington Redskins quarterback Robert Griffin III (10) practices during an NFL football organized team activity at Redskins Park in Ashburn, Va., Thursday, May 30, 2013. (AP Photo/Charles Dharapak)

Philadelphia Eagles quarterback Michael Vick speaks to reporters after practice at the team's NFL football training facility, Friday, May 31, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles quarterback Matt Barkley practices at the team's NFL football training facility, Friday, May 31, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles quarterbacks Michael Vick, right, and Dennis Dixon, practice at the team's NFL football training facility, Friday, May 31, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Baltimore Ravens offensive coordinator Jim Caldwell speaks during a news conference after an NFL football practice at the team's practice facility in Owings Mills, Md., Friday, May 31, 2013. (AP Photo/Patrick Semansky)

New York Giants' Louis Murphy, center, is blocked by David Caldwell, left, and Charles James during NFL football pracitce, Thursday, May 30, 2013, in East Rutherford, N.J. (AP Photo/Julio Cortez)

New York Jets quarterback Geno Smith (7) throws a pass during NFL football practice in Florham Park, N.J., Thursday, May 30, 2013. (AP Photo/Rich Schultz)

Denver Broncos cornerbacks Champ Bailey (24) and Tony Carter (32) talk at the NFL football team's training facility in Englewood, Colo., on Thursday, May 30, 2013. (AP Photo/Ed Andrieski)

Denver Broncos quarterback Peyton Manning (18) talks to teammates during stretching at off season training camp at the NFL football team's training facility in Englewood, Colo., on Thursday, May 30, 2013. (AP Photo/Ed Andrieski)

Pittsburgh Steelers quarterback Ben Roethlisberger smiles during the NFL football practice on Thursday, May 30, 2013 in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers linebackers Larry Foote (50), Vince Williams (44) and LaMarr Woodley (56) perform an agility drill during NFL football practice on Thursday, May 30, 2013, in Pittsburgh. (AP Photo/Keith Srakocic)

New York Giants quarterback Eli Manning throws a pass during NFL football practice, Thursday, May 30, 2013, in East Rutherford, N.J. (AP Photo/Julio Cortez)

New York Jets quarterbacks Geno Smith (7), Mark Sanchez (6), Greg McElroy (14) and Matt Simms (5) drop back to pass during a drill at NFL football practice in Florham Park, N.J., Thursday, May 30, 2013. (AP Photo/Rich Schultz)

Carolina Panthers' Ted Ginn Jr. catches a pass during NFL football practice in Charlotte, N.C., Thursday, May 30, 2013. (AP Photo/Bob Leverone)

New Orleans Saints head coach Sean Payton watches his team during NFL football practice at the team's training facility in Metairie, La., Thursday, May 30, 2013. (AP Photo/Gerald Herbert)

Cleveland Browns' Trent Richardson works on conditioning during practice at the NFL football team's training camp Thursday, May 30, 2013, in Berea, Ohio. Richardson is not practicing again because of a shin injury that could keep him sidelined for an extended period. (AP Photo/Tony Dejak)

Cleveland Browns quarterback Brandon Weeden throws a pass during practice at the NFL football team's training camp Thursday, May 30, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Detroit Lions running back Reggie Bush practices during NFL football organized training activities in Allen Park, Wednesday, May 29, 2013. (AP Photo/Paul Sancya)

Miami Dolphins quarterback Ryan Tannehill runs drills during NFL football practice, Wednesday, May 29, 2013, at the team's training facility in Davie, Fla. (AP Photo/Wilfredo Lee)

New England Patriots quarterbackTom Brady passes during NFL football practice in Foxborough, Mass., Wednesday, May 29, 2013. (AP Photo/Michael Dwyer)

Cincinnati Bengals wide receiver A.J. Green yawns during NFL football practice, Wednesday, May 29, 2013, in Cincinnati. (AP Photo/Al Behrman)

Indianapolis Colts quarterback Andrew Luck, left, throws to quarterback Matt Hasselbeck during the NFL team's football organized team activity in Indianapolis, Wednesday, May 29, 2013. (AP Photo/Michael Conroy)

Kansas City Chiefs quarterback Alex Smith (11) participates in a drill during an NFL football training practice Wednesday, May 29, 2013, in (AP Photo/Charlie Riedel)

Cincinnati Bengals quarterback Andy Dalton rolls out to pass during NFL football practice, Wednesday, May 29, 2013, in Cincinnati. (AP Photo/Al Behrman)

Tampa Bay Buccaneers quarterback Josh Freeman throws a pass during an optional NFL football workout Wednesday, May 29, 2013, in Tampa, Fla. (AP Photo/Chris O'Meara)

Oakland Raiders defensive backs go through drills during practice at the NFL football team's training facility in Alameda, Calif., Tuesday, May 28, 2013. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders' Charles Woodson awaits the ball during practice at the NFL football team's training facility in Alameda, Calif., Tuesday, May 28, 2013. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders quarterback Matt Flynn throws during practice at the NFL football team's training facility in Alameda, Calif., Tuesday, May 28, 2013. (AP Photo/Marcio Jose Sanchez)

Dallas Cowboys cornerback Brandon Carr (39) and receiver Dez Bryant (88) battle for a pass during an organized team activity (OTA) on Tuesday, May 28, 2013 at the club's headquarters in Irving, Texas. (AP Photo/James D Smith)

New Orleans Saints quarterback Drew Brees drops back to throw at their NFL football training facility in Metairie, La., Thursday, May 23, 2013. (AP Photo/Gerald Herbert)

St Louis Ram's Sammy Brown (57) runs a tackling drill during NFL football practice, Thursday, May, 23, 2013, at the team's training facility in St. Louis. (AP Photo/Bill Boyce)

Washington Redskins quarterback Robert Griffin III (10) throws the ball during organized team activities at Redskins Park on May 23, 2013 in Ashburn, VA. (Geoff Burke/USA TODAY Sports)

New York Jets wide receiver Thomas Mayo catches a pass during NFL football practice in Florham Park, N.J., Wednesday, May 22, 2013. (AP Photo/Mel Evans)

Arizona Cardinals' Larry Fitzgerald runs drills during the team's NFL football organized team activities Tuesday, May 21, 2013, in Tempe, Ariz. (AP Photo/Matt York)

Seattle Seahawks wide receiver Percy Harvin (11) participates in organized team activities at the Virginia Mason Athletic Center on May 20, 2013 in Seattle, WA. (Joe Nicholson/USA TODAY Sports)