San Diego Chargers quarterback Charlie Whitehurst hands off during NFL football minicamp Thursday, April 18, 2013 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers tackle Jeromey Clary, left, blocks tackle King Dunlap during the teams' voluntary minicamp practice Thursday April 18, 2013 in San Diego. (AP photo/Lenny Ignelzi)

San Diego Chargers receiver Dan DePalma pulls in a pass as assistant coach Nick Sirianni chases during NFL football minicamp Thursday April 18, 2013 in San Diego. (AP photo/Lenny Ignelzi)

San Diego Chargers receiver Vincent Brown, who is limited in his drills while recovering from an injury that cost him the entire regular season in 2012, stretches during NFL football minicamp Thursday April 18, 2013 in San Diego. (AP photo/Lenny Ignelzi)

San Diego Chargers quarterback Philip Rivers (17) gives instructions to receivers during NFL football minicamp Thursday April 18, 2013 in San Diego. (AP Photo/Lenny Ignelzi)

San Diego Chargers receiver Danario Alexander reaches for a throw during drills at the teams' voluntary minicamp practice Thursday, April 18, 2013 in San Diego. (AP photo/Lenny Ignelzi)

San Diego Chargers head coach Mike McCoy, starting his first season with the Chargers, walks the sidelines while being videoed by the Chargers' personnel during NFL football minicamp Thursday, April 18, 2013 in San Diego. (AP Photo/Lenny Ignelzi)

Peyton Manning working out with a medicine ball during NFL football offseason training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Jacksonville Jaguars quarterback Blaine Gabbert (11) passes the ball during a voluntary veteran NFL football mini-camp, Tuesday, April 16, 2013, in Jacksonville, Fla. (AP Photo/Stephen Morton)

Cleveland Browns quarterback Jason Campbell throws during NFL football mini-camp at the team's training facility, Tuesday, April 16, 2013, in Berea, Ohio. Brandon Weeden and Campbell threw passes side-by-side as the Browns opened their first mini-camp of the season. The 29-year-old Weeden is the incumbent and started 15 games last year. He was the 22nd overall pick in the 2012 draft. Campbell, 31, was signed as a free agent on March 26. The ninth-year pro appeared in six games last season with the Bears. (AP Photo/Tony Dejak)

Cleveland Browns head coach Rob Chudzinski watches during NFL football mini-camp at the team's training facility, Tuesday, April 16, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns defensive back T.J. Ward (43) stretches as he works through drills during NFL football mini-camp at the team's training facility, Tuesday, April 16, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Jacksonville Jaguars running back Justin Forsett (21) runs the ball during a voluntary veteran NFL football mini-camp, Tuesday, April 16, 2013, in Jacksonville, Fla. (AP Photo/Stephen Morton)

Chicago Bears Tom Zbikowski runs a drill during their NFL football mini-camp at Halas Hall on Tuesday, April 16, 2013, in Lake Forest, Ill. (AP Photo/Jim Prisching)

Chicago Bears' Matt Forte, left, runs with the ball during their NFL football mini-camp at Halas Hall on Tuesday, April 16, 2013, in Lake Forest, Ill. (AP Photo/Jim Prisching)

Chicago Bears head coach Marc Trestman left, talks with senior director of Corporate Communications Scott Hagel after the Bears first day of mini camp at Halas Hall on Tuesday, April 16, 2013, in Lake Forest, Ill. (AP Photo/Jim Prisching)

Chicago Bears' Jay Cutler (6) passes the ball during their NFL football mini-camp at Halas Hall on Tuesday, April 16, 2013, in Lake Forest, Ill. (AP Photo/Jim Prisching)

Chicago Bears' Jay Cutler heads to a news conference on the field after the first day of their NFL football mini-camp at Halas Hall on Tuesday, April 16, 2013, in Lake Forest, Ill. (AP Photo/Jim Prisching)

San Diego Chargers quarterback Philip Rivers addresses reporters following the team's first voluntary NFL football mini-camp practice, Tuesday, April 16, 2013, in San Diego. (AP Photo/Lenny Ignelzi)

Buffalo Bills' Mario Williams stretches at the start of the team's voluntary offseason conditioning program at the team's NFL football training facility in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Buffalo Bills' Mario Williams speaks during a news news conference at the team's NFL football training facility in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Buffalo Bills' Stevie Johnson speaks at the start of the team's voluntary offseason conditioning program at the team's NFL football training facility in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Buffalo Bills' Stevie Johnson jogs during the team's voluntary offseason conditioning program at the team's NFL football training facility in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Buffalo Bills' Fred Jackson stretches at the start of the team's voluntary offseason NFL football conditioning program in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Buffalo Bills' Fred Jackson stretches at the start of the team's voluntary offseason conditioning program at the team's NFL football training facility in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Buffalo Bills' head coach Doug Marrone speaks at the start of the team's voluntary offseason NFL football conditioning program in Orchard Park, N.Y., Tuesday, April 2, 2013. (AP Photo/Bill Wippert)

Philadelphia Eagles' Jason Peters works out at the team's NFL football training facility, Tuesday, April 2, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' Brandon Graham speaks during a news conference at the team's NFL football training facility, Tuesday, April 2, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' Brandon Graham works out at the team's NFL football training facility, Tuesday, April 2, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' Nick Foles speaks during a news conference at the team's NFL football training facility, Wednesday, April 3, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' DeSean Jackson speaks during a news conference at the team's NFL football training facility, Wednesday, April 3, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' DeMeco Ryans works out at the team's NFL football training facility, Wednesday, April 3, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' DeMeco Ryans works out at the team's NFL football training facility, Wednesday, April 3, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' Connor Barwin at the team's NFL football training facility, Wednesday, April 3, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Philadelphia Eagles' Trent Cole works out at the team's NFL football training facility, Wednesday, April 3, 2013, in Philadelphia. (AP Photo/Matt Rourke)

Eric Decker, foreground, stretching during NFL football off season training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Peyton Manning working out with a medicine ball during NFL football offseason training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Peyton Manning, center right, stretching with teammates during NFL football off season training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Knowshon Moreno doing pull-ups during NFL football offseason training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Wes Welker, second from right, stretches with teammates during NFL football off season training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Louis Vasquez, right, working out with teammates on a drill during NFL football offseason training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Ronnie Hillman stretching during NFL football off season training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Wes Welker stretching Eric Decker during NFL football offseason training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Denver Broncos strength and conditioning coach Jason George, left, calling out drills during NFL football off season training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Peyton Manning , center, working out during NFL football offseason training at Denver Broncos Dove Valley facility in Englewood, Colo., on Monday, April 15, 2013. (AP Photo/Denver Broncos, Eric Bakke)

Cleveland Browns running back Trent Richardson catches a pass during an NFL football mini-camp on Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns kicker Shayne Graham practices kicking during an NFL football mini-camp on Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns wide receiver Greg Little (15) runs through drills during an NFL football mini-camp on Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns linebacker D'Qwell Jackson runs drills during NFL football mini-camp at the team's training facility, Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns defensive back Joe Haden stretches during NFL football mini-camp at the team's training facility, Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns quarterback Brandon Weeden takes a break during NFL football mini-camp at the team's training facility, Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns quarterback Jason Campbell takes a snap from Alex Mack during NFL football mini-camp at the team's training facility, Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns defensive back Joe Haden runs through drills during an NFL football mini-camp on Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Cleveland Browns wide receiver Josh Gordon catches a pass during an NFL football mini-camp on Wednesday, April 17, 2013, in Berea, Ohio. (AP Photo/Tony Dejak)

Buffalo Bills wide receiver Stevie Johnson makes a catch during NFL football minicamp in Orchard Park, N.Y., Thursday, April 18, 2013. (AP Photo/David Duprey)

Buffalo Bills quarterback Kevin Kolb throws during NFL football minicamp in Orchard Park, N.Y., Thursday, April 18, 2013. (AP Photo/David Duprey)