Minnesota Vikings wide receivers Percy Harvin, left, and Jerome Simpson enjoy a break during NFL football practice, Thursday, June 21, 2012, in Eden Prairie, Minn. Harvin has asked to be traded, saying earlier in the week he was upset with the team but not elaborating. (AP Photo/Jim Mone)

Minnesota Vikings wide receiver Percy Harvin carries the ball during NFL football practice, Thursday, June 21, 2012, in Eden Prairie, Minn. Harvin has asked to be traded, saying earlier in the week he was upset with the team but not elaborating. (AP Photo/Jim Mone)

Atlanta Falcons wide receiver Julio Jones, left, talks with team owner Arthur Blank during NFL football minicamp, Tuesday, June 19, 2012, in Flowery Branch, Ga. (AP Photo/David Goldman)

Atlanta Falcons defensive end John Abraham takes part in NFL football practice, Thursday, June 21, 2012, in Flowery Branch, Ga. For much of the free agency period, it appeared likely the Falcons would lose Abraham, the team's top pass rusher. Instead Abraham has returned to find his new defensive coordinator is Mike Nolan, who was the Jets' defensive coordinator for his 2000 rookie season. Abraham says it's a perfect fit. (AP Photo/David Goldman)

Atlanta Falcons head coach Mike Smith conducts NFL football practice, Thursday, June 21, 2012, in Flowery Branch, Ga. (AP Photo/David Goldman)

Miami Dolphins' Vontae Davis reacts during NFL football practice in Davie, Fla., Wednesday, June 20, 2012. (AP Photo/J Pat Carter)

Buffalo Bills' Ryan Fitzpatrick throws during NFL football practice in Orchard Park, N.Y., Wednesday, June 20, 2012. (AP Photo/David Duprey)

Buffalo Bills' Fred Jackson runs a drill during NFL football practice in Orchard Park, N.Y., Wednesday, June 20, 2012. (AP Photo/David Duprey)

Buffalo Bills' Stevie Johnson makes a catch during NFL football practice in Orchard Park, N.Y., Wednesday, June 20, 2012. (AP Photo/David Duprey)

Minnesota Vikings quarterback Christian Ponder (7) throws under the watchful eyes of backup quarterbacks during the opening day of the NFL football team's minicamp Tuesday, June 19, 2012, in Eden Prairie, Minn. (AP Photo/Jim Mone)

Miami Dolphins player Chad Ochocinco catches a pass during NFL football practice in Davie, Fla. Tuesday, June 19, 2012. (AP Photo/J Pat Carter)

Minnesota Vikings defensive end Jared Allen enjoys a playful moment during the team's NFL football walk-through morning practice, Tuesday, June 19, 2012, in Eden Prairie, Minn. Allen, who skipped all of the voluntary workouts this off season, but arrived for the mandatory minicamp following last season when he had 22 sacks. (AP Photo/Jim Mone)

Tennessee Titans defensive end Dave Ball knocks down a tackling dummy during an NFL football practice on Tuesday, June 19, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Tennessee Titans linebacker Will Witherspoon (92) runs a drill against linebacker Zach Brown, left, during NFL football practice on Tuesday, June 19, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Tennessee Titans running back Herb Donaldson, center, runs a gauntlet of blocking pads during an NFL football practice on Tuesday, June 19, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Miami Dolphins football player Chad Ochocinco (85) waits to catch a pass thrown by quarterback David Garrard (9) during NFL practice in Davie, Fla. Tuesday, June 19, 2012. (AP Photo/J Pat Carter)

Miami Dolphins quarterback Ryan Tannehill runs drills during NFL football practice in Davie, Fla. Tuesday, June 19, 2012. (AP Photo/J Pat Carter)

Miami Dolphins football player Chad Ochocinco talks to the media after NFL practice in Davie, Fla. Tuesday, June 19, 2012. (AP Photo/J Pat Carter)

Denver Broncos quarterback Peyton Manning, left, jokes with quarterbacks coach Adam Gase during an NFL football practice at the team's training facility in Englewood, Colo., on Thursday, June 14, 2012. (AP Photo/David Zalubowski)

In this photo made June 6, 2012, Cleveland Browns quarterback Colt McCoy passes during practice at the NFL football team's headquarters in Berea, Ohio. While rookie Brandon Weeden is the presumed winner of Cleveland's quarterback competition, Browns coach Pat Shurmur has been reluctant to name him the starter over McCoy. (AP Photo/Mark Duncan)

Detroit Lions linebacker Travis Lewis (50) runs a drill during NFL football practice in Allen Park, Mich., Tuesday, June 12, 2012. (AP Photo/Paul Sancya)

Detroit Lions defensive backs Ross Weaver, left, and Amari Spievey drill during NFL football practice in Allen Park, Mich., Tuesday, June 12, 2012. (AP Photo/Paul Sancya)

Detroit Lions running back Jahvid Best catches a ball during NFL football practice in Allen Park, Mich., Tuesday, June 12, 2012. (AP Photo/Paul Sancya)

Pittsburgh Steelers linebacker Brandon Hicks participates in drills during NFL football practice, Tuesday, June 12, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers second round draft choice, offensive tackle Mike Adams, left, participates in blocking drills during the NFL football practice on, Tuesday, June 12, 2012, in Pittsburgh. (AP Photo/Keith Srakocic)

New England Patriots wide receiver Wes Welker runs out the play after catching a pass during the first day of NFL football minicamp at the team's facility in Foxborough, Mass., Tuesday, June 12, 2012. (AP Photo/Stephan Savoia)

New England Patriots quarterback Tom Brady, right, takes off his helmet as he and wide receiver Deion Branch (84) move from one drill to another during the first day of NFL football minicamp at the team's training facility in Foxborough, Mass., Tuesday, June 12, 2012. (AP Photo/Stephan Savoia)

New England Patriots wide receiver Donte Stallworth runs after a catch during the first day of NFL football minicamp at the team's training facility in Foxborough, Mass., Tuesday, June 12, 2012. (AP Photo/Stephan Savoia)

New York Jets quarterbacks coach Matt Cavanaugh, right, watches as Mark Sanchez, left, and Tim Tebow throw during NFL football practice in Florham Park, N.J., Tuesday, June 12, 2012. (AP Photo/Mel Evans)

Carolina Panthers receiver Steve Smith (89) catches a ball during an NFL football practice in Charlotte, N.C., Tuesday, June 12, 2012. Smith enters 2012 with a renewed enthusiasm after a stellar season a year ago. (AP Photo/Chuck Burton)

Carolina Panthers receiver Steve Smith, left, reaches out to assistant coach Ricky Proehl, right, during an NFL football practice in Charlotte, N.C., Tuesday, June 12, 2012. Smith enters 2012 with a renewed enthusiasm after a stellar season a year ago. (AP Photo/Chuck Burton)

Carolina Panthers' David Gettis (12) stretches before an NFL football practice in Charlotte, N.C., Tuesday, June 12, 2012. (AP Photo/Chuck Burton)

Tennessee Titans quarterbacks Matt Hasselbeck (8) and Jake Locker (10) run plays during NFL football practice on Tuesday, June 12, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Tennessee Titans wide receiver Michael Preston, right, prepares to get hit with a blocking pad after running through blocking dummies during NFL football practice on Tuesday, June 12, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Minnesota Vikings linebacker Marvin Mitchell, right, blocks teammate Rhett Ellison, left, during NFL football practice, Tuesday, June 12, 2012, in Eden Prairie, Minn. (AP Photo/Genevieve Ross)

Arizona Cardinals quarterback Kevin Kolb (4) throws during football practice Tuesday, June 12, 2012 in Tempe, Ariz. (AP Photo/Matt York)

Arizona Cardinals wide receiver Larry Fitzgerald pulls in a pass during football practice Tuesday, June 12, 2012 in Tempe, Ariz. (AP Photo/Matt York)

New York Jets players run drills during NFL football practice in Florham Park, N.J., Tuesday, June 12, 2012. (AP Photo/Mel Evans)

New York Jets players line up during NFL football practice in Florham Park, N.J., Tuesday, June 12, 2012. (AP Photo/Mel Evans)

Tennessee Titans rookie cornerback Gary Wilburn leaps to catch a pass during NFL football practice on Tuesday, June 12, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Washington Redskins quarterback Robert Griffin III throws a pass during NFL football practice at Redskins Park in Ashburn, Va., Tuesday, June 12, 2012. (AP Photo/Pablo Martinez Monsivais)

San Diego Chargers running back Ryan Mathews flexes his arm during NFL football practice Tuesday, June 12, 2012, in San Diego. The Chargers look to rely on Mathews for the 2012 season, after he rushed for 1,091 yards in 2011 and added 455 as a pass-catcher. (AP Photo/Gregory Bull)

Oakland Raiders', from left, Conroy Black, Henry Aaron, Shawntae Spencer and Terrail Lambert go through drills during NFL football practice in Alameda, Calif., Tuesday, June 12, 2012. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders quarterback Carson Palmer, left, hands off running back Darren McFadden during NFL football practice in Alameda, Calif., Tuesday, June 12, 2012. (AP Photo/Marcio Jose Sanchez)

Oakland Raiders quarterback Terrelle Pryor (6) throws next to quarterback Carson Palmer (3) during NFL football practice in Alameda, Calif., Tuesday, June 12, 2012. (AP Photo/Marcio Jose Sanchez)

Houston Texans' Brandon Brooks, right, and Nick Mondek participate in blocking drills during NFL football practice, Tuesday, June 12, 2012, in Houston. (AP Photo/Pat Sullivan)

Houston Texans' Whitney Mercilus eyes a tackling dummy during NFL football practice, Tuesday, June 12, 2012, in Houston. (AP Photo/Pat Sullivan)

Kansas City Chiefs quarterback Matt Cassel throws a pass during NFL football practice in Kansas City, Mo., Tuesday, June 12, 2012. (AP Photo/Orlin Wagner)

Kansas City Chiefs running back Dexter McCluster (22) breaks away from defensive back Travis Daniels (34) during NFL football practice in Kansas City, Mo., Tuesday, June 12, 2012. (AP Photo/Orlin Wagner)

Baltimore Ravens tight end Ed Dickson stands in a heavy rain during NFL football practice Tuesday, June 12, 2012 in Owings Mills, Md. (AP Photo/Gail Burton)

Baltimore Ravens wide receiver Jacoby Jones catches a punt during NFL football practice Tuesday, June 12, 2012 in Owings Mills, Md. (AP Photo/Gail Burton)

In this June 1, 2012 photo, Tennessee Titans defensive end Kamerion Wimbley smiles during practice at the team's NFL football training facility in Nashville, Tenn. The Titans are hoping that Wimbley, who previously played for the Oakland Raiders, can boost their pass rush. (AP Photo/Mark Humphrey)

Indianapolis Colts quarterback Andrew Luck does push-ups as Chandler Harnish walks past during NFL football practice Tuesday, June 12, 2012, in Indianapolis. (AP Photo/Darron Cummings)

Indianapolis Colts quarterback Andrew Luck (12) hands off to Donald Brown (31) during NFL football practice Tuesday, June 12, 2012, in Indianapolis. (AP Photo/Darron Cummings)

Indianapolis Colts' Cory Redding jokes with officials during NFL football practice Tuesday, June 12, 2012, in Indianapolis (AP Photo/Darron Cummings)

Indianapolis Colts quarterback Andrew Luck (12) talks with Chandler Harnish as they run during NFL football practice Tuesday, June 12, 2012, in Indianapolis. (AP Photo/Darron Cummings)

Indianapolis Colts quarterback Andrew Luck runs to a drill during NFL football practice Tuesday, June 12, 2012, in Indianapolis. (AP Photo/Darron Cummings)

Green Bay Packers quarterback Aaron Rodgers (12) encourages his teammates during NFL football minicamp Tuesday, June 12, 2012, in Green Bay, Wis. (AP Photo/Mike Roemer)

Green Bay Packers defensive back Charles Woodson focuses on a pass during NFL football minicamp Tuesday, June 12, 2012, in Green Bay, Wis. (AP Photo/Mike Roemer)

Green Bay Packers defensive backs Otis Merrill, left and Casey Hayward laugh during NFL football minicamp Tuesday, June 12, 2012, in Green Bay, Wis. (AP Photo/Mike Roemer)

Green Bay Packers linebacker Clay Matthews runs through a drill during NFL football minicamp Tuesday, June 12, 2012, in Green Bay, Wis. (AP Photo/Mike Roemer)

Green Bay Packers quarterback B.J. Coleman throws a pass during NFL football practice, Tuesday, June 12, 2012, in Green Bay, Wis. (AP Photo/Mike Roemer)

Chicago Bears defensive end Israel Idonije, right, puts his arm around Julius Peppers (90) near the end of NFL football practice Tuesday, June 12, 2012 in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

Chicago Bears offensive coordinator Mike Tice, left, bumps fists with wide receiver Brandon Marshall during NFL football practice Tuesday, June 12, 2012, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

Chicago Bears coach Lovie Smith leads his team during NFL football practice Tuesday, June 12, 2012, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

Cincinnati Bengals quarterbacks Andy Dalton (14) and Bruce Gradkowski (7) walk off the field following NFL football practice, Tuesday, June 12, 2012, in Cincinnati. (AP Photo/Al Behrman)

Jacksonville Jaguars defensive end Andre Branch runs through a drill during NFL football practice, Thursday, June 14, 2012, in Jacksonville, Fla. (AP Photo/John Raoux)

Jacksonville Jaguars quarterback Blaine Gabbert (11) throws a pass during a scrimmage at NFL football practice, Thursday, June 14, 2012, in Jacksonville, Fla. (AP Photo/John Raoux)

Jacksonville Jaguars tight end Zach Potter, left, goes through a drill with Matt Veldman during NFL football practice, Thursday, June 14, 2012, in Jacksonville, Fla. (AP Photo/John Raoux)

Jacksonville Jaguars receiver Laurent Robinson catches a pass during NFL football practice, Thursday, June 14, 2012, in Jacksonville, Fla. (AP Photo/John Raoux)

Denver Broncos quarterback Peyton Manning (18) stretches during an NFL football practice at the team's training facility in Englewood, Colo., on Thursday, June 14, 2012. (AP Photo/David Zalubowski)

Denver Broncos tight end Joel Dreessen catches a pass during an NFL football practice at the team's training facility in Englewood, Colo., on Thursday, June 14, 2012. (AP Photo/David Zalubowski)

St. Louis Rams running back Steven Jackson (39) runs the ball during the team's practice, Thursday, June 14, 2012 in St. Louis.(AP Photo/Tom Gannam)

St. Louis Rams head coach Steve Fisher talks to his players during practice, Thursday, June 14, 2012 in St. Louis.(AP Photo/Tom Gannam)

St. Louis Rams offensive coordinator Brian Schottenheimer, center, talks with quarterbacks Kellen Clemens (10) and Austin Davis (9) during NFL football practice, Thursday, June 14, 2012 in St. Louis.(AP Photo/Tom Gannam)

St. Louis Rams cornerback Kendrick Burney, left, breaks up a pass to wide receiver Steve Smith during NFL football practice, Thursday, June 14, 2012 in St. Louis.(AP Photo/Tom Gannam)

Dallas Cowboys defensive coordinator Rob Ryan, left, and head coach Jason Garrett watch NFL football practice at Cowboys Stadium Thursday, June 14, 2012, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys wife receiver Dez Bryant (88) grabs a pass during NFL football practice at Cowboys Stadium Thursday, June 14, 2012 in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) talks with running back DeMarco Murray (26) during NFL football practice at Cowboys Stadium Thursday, June 14, 2012 in Arlington, Texas. (AP Photo/LM Otero)

Carolina Panthers players, from left, Hubert Anyiam, Frank Alexander, Rico Wallace, Matt Reynolds, and Jared Green greets fans after an NFL football practice in Charlotte, N.C., Thursday, June 14, 2012. (AP Photo/Chuck Burton)

Carolina Panthers coach Ron Rivera, right, talks with receiver Steve Smith, left, during NFL football practice in Charlotte, N.C., Thursday, June 14, 2012. (AP Photo/Chuck Burton)

Tate Olsen, one, son of Carolina Panthers' Greg Olsen, plays with a football during NFL football practice in Charlotte, N.C., Thursday, June 14, 2012. (AP Photo/Chuck Burton)

Carolina Panthers quarterback Cam Newton takes photos of fans with a photographer's camera after NFL football practice in Charlotte, N.C., Thursday, June 14, 2012. (AP Photo/Chuck Burton)

Water is dumped on the hands of Carolina Panthers' J.J. Jansen during NFL football practice in Charlotte, N.C., Thursday, June 14, 2012. (AP Photo/Chuck Burton)

Arizona Cardinals rookie receiver Michael Floyd (15) tosses the ball back to a quarterback as DeMarco Sampson stands next to him during NFL football practice, Thursday, June 14, 2012, in Tempe, Ariz.(AP Photo/Ross D. Franklin)

Arizona Cardinals' Darnell Dockett knocks over a quarterback dummy in defensive drills during minicamp NFL football practice on Thursday, June 14, 2012, in Tempe, Ariz. (AP Photo/Ross D. Franklin)

New York Giants quarterbacks Eli Manning, right, Ryan Perrilloux, center, and David Carr, left, walk together during NFL football practice in East Rutherford, N.J., Thursday, June 14, 2012. (AP Photo/Mel Evans)

Chicago Bears quarterback Jay Cutler (6) and Jason Campbell (2) watch teammates during an NFL football practice in Lake Forest, Ill., Thursday, June 14, 2012. (AP Photo/Nam Y. Huh)

Tennessee Titans center Kevin Matthews, left, and offensive tackle Michael Otto, right, take part in a drill during NFL football practice on Thursday, June 14, 2012, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Seattle Seahawks quarterback Tavaris Jackson (7) leads quarterback Matt Flynn (15) and other players through an agility drill during a NFL football practice, Thursday, June 14, 2012, in Renton, Wash. (AP Photo/Ted S. Warren)

Seattle Seahawks quarterback Matt Flynn throws a pass during a NFL football practice, Thursday, June 14, 2012, in Renton, Wash. (AP Photo/Ted S. Warren)

San Francisco 49ers wide receiver Michael Crabtree, left, and tight end Vernon Davis, right, both wearing number 85, laugh during NFL football practice at the 49ers training facility in Santa Clara, Calif., Thursday, June 14, 2012. Davis wears number 85 during the season. (AP Photo/Paul Sakuma)

Chicago Bears wide receiver Johnny Knox looks to a pass during an NFL football practice in Lake Forest, Ill., Thursday, June 14, 2012. (AP Photo/Nam Y. Huh)

Seattle Seahawks' Leon Washington, left, takes a handoff from quarterback Tavaris Jackson, second from left, as Kregg Lupkin (20) squares off to block Heath Farwell, right, during a NFL football practice, Thursday, June 14, 2012, in Renton, Wash. (AP Photo/Ted S. Warren)

Chicago Bears tight end Evan Rodriguez (88) catches a ball against linebacker Blake Costanzo (52) during an NFL football practice in Lake Forest, Ill., Thursday, June 14, 2012. (AP Photo/Nam Y. Huh)