Detroit Lions defensive end Cliff Avril knocks down a tacking dummy during drills at the NFL football team's training camp in Allen Park, Mich., Friday, Aug. 5, 2011. (AP Photo/Carlos Osorio)

Detroit Lions free agents, from left, Rashied Davis, Ashlee Palmer, Bobby Carpenter, Drew Stanton and Paul Pratt run onto the field to start drills at the NFL football team's training camp in Allen Park, Mich., Thursday, Aug. 4, 2011. (AP Photo/Carlos Osorio)

Detroit Lions linebacker Cobrani Mixon runs drills during NFL football training camp Thursday, Aug. 4, 2011, in Allen Park, Mich. (AP Photo/Carlos Osorio)

Detroit Lions defensive tackle Quinn Pitcock hits a tackling sled during drills at the NFL football team's training camp in Allen Park, Mich., Thursday, Aug. 4, 2011. (AP Photo/Carlos Osorio)

Detroit Lions running back Aaron Brown keeps the ball close during drills at the NFL football team's training camp in Allen Park, Mich., Thursday, Aug. 4, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive end Greg Banks, front left, and defensive tackle Quinn Pitcock hit a blocking sled during drills at NFL football training camp in Allen Park, Mich., Thursday, Aug. 4, 2011. (AP Photo/Carlos Osorio)

Detroit Lions tight end Tony Scheffler hugs his 4-year-old daughter Braiden during NFL football training camp Thursday, Aug. 4, 2011, in Allen Park, Mich. (AP Photo/Carlos Osorio)

Detroit Lions center Dan Gerberry goes up against defensive tackle Robert Callaway (61) during drills at the NFL football team's training camp in Allen Park, Mich., Friday, Aug. 5, 2011. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Matthew Stafford throws during drills at the NFL football team's training camp in Allen Park, Mich., Friday, Aug. 5, 2011. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Drew Stanton throws during drills at the NFL football team's training camp in Allen Park, Mich., Friday, Aug. 5, 2011. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Zac Robinson throws during drills at the NFL football team's training camp in Allen Park, Mich., Friday, Aug. 5, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive tackle Nick Fairley (98) wearing a leg brace, watches drills during practice at NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive tackle Ndamukong Suh (90) runs drills during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions defensive tackle Nick Fairley (98) and defenses tackle Sammie Hill (61) runs drills during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions defensive tackle Nick Fairley (98) and defensive tackle Ndamukong Suh (90) talk during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions quarterback Matthew Stafford (9) runs sprints during their NFL football training camp practice at the Detroit Lions training facility in Allen Park, MI, Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions cornerback Amari Spievey (42) makes a catch during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions President Tom Lewand (right) and head coach Jim Schwartz (left) talk during their NFL football training camp practice at the Detroit Lions training facility in Allen Park, MI, Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions running back Jahvid Best (44) runs drills during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Bill Ford Jr. talks to the media during the Lions NFL football training camp practice at the Detroit Lions training facility in Allen Park, MI, Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions quarterback Matthew Stafford (9) passes during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions wide receiver Calvin Johnson (81) makes a catch during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions defensive tackle Ndamukong Suh (90) lines up for a drill during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions running back Mikel Leshoure (25) runs drills during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions wide receiver Calvin Johnson (81) makes a catch during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions defensive tackle Nick Fairley (98) runs drills during NFL football training camp at the team's practice facility in Allen Park, Mich., Saturday, July 30, 2011. (AP Photo/Rick Osentoski)

Detroit Lions defensive tackles Nick Fairley, left, and Ndamukong Suh run after NFL football training camp at the team's indoor practice facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions defensive tackle Ndamukong Suh runs a drill during their NFL football training camp practice at the teams indoor training facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions quarterback Matthew Stafford throws during NFL football training camp at the team's indoor practice facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions defensive tackle Nick Fairley runs during their NFL football training camp practice at the teams indoor training facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions defensive tackle Nick Fairley runs a drill during their NFL football training camp practice at the teams indoor training facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions defensive tackle Nick Fairley (98) runs a drill as Kyle Vanden Bosch (93) watches during their NFL football training camp practice at the teams indoor training facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions defensive tackle Nick Fairley, left, asks Ndamukong Suh, right, a question during NFL football training camp the team's indoor training facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions defensive tackle Nick Fairley, left, asks Ndamukong Suh, right, a question during NFL football training camp at the team's indoor training facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions president Tom Lewand, left, head coach Jim Schwartz, center, and general manager Martin Mayhew talk after NFL football training camp at the team's indoor practice facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Jul 28, 2011; Allen Park, MI, USA; Detroit Lions head coach Jim Schwartz during a press conference at the Detroit Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

Jul 28, 2011; Allen Park, MI, USA; A general view of the Detroit Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

Jul 28, 2011; Allen Park, MI, USA; Detroit Lions head coach Jim Schwartz during a press conference at the Detroit Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

Jul 28, 2011; Allen Park, MI, USA; A general view of the Detroit Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

Jul 28, 2011; Allen Park, MI, USA; Detroit Lions head coach Jim Schwartz during a press conference at the Detroit Lions training facility. Mandatory Credit: Andrew Weber-US PRESSWIRE

Detroit Lions quarterback Matthew Stafford stretches during NFL football training camp at the team's indoor practice facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions quarterback Matthew Stafford (9) hands off to running back Mikel Leshoure during NFL football training camp at the team's indoor practice facility in Allen Park, Mich., Friday, July 29, 2011. (AP Photo/Paul Sancya)

Detroit Lions receiver Michael Moore catches a pass while defended by cornerback Aaron Berry (32) during drills at NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions receiver Rashied Davis (82) watches as teammate Stefan Logan, left, walks on his hands during a break in practice at NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Matthew Stafford prepares to throw during NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive line coach Kris Kocurek instructs his players during practice at NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions receiver Calvin Johnson signs autographs after practice at NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive linemen from left, Robert Callaway, Willie Young, Kyle Vanden Bosch and Narada Williams stand during a break in NFL football training camp in Allen Park, Mich., Tuesday, Aug. 2, 2011. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Matthew Stafford, left, and defensive end Kyle Vanden Bosch stretch before running drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions receiver Dominique Barnes catches a pass during drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions kicker Jason Hanson practices his kicks during drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive tackle Ndamukong Suh runs through tackling dummies during drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive coordinator Gunther Cunningham directs his team during drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions defensive end Kyle Vanden Bosch runs through blocking dummies during drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Shaun Hill (14) fakes a hand off to receiver Tim Toone during drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)

Detroit Lions running back Mikel Leshoure runs through drills at NFL football training camp in Allen Park, Mich., Wednesday, Aug. 3, 2011. (AP Photo/Carlos Osorio)