Detroit Lions quarterback Matthew Stafford throws during NFL football minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions quarterback Taylor Bennett, right, prepares to throw to running back Jahvid Best during rookie football mini-camp at the team's practice facility in Allen Park, Mich, Friday, April 30, 2010. (AP Photo/Carlos Osorio)

Detroit Lions rookie running back Jahvid Best runs drills during NFL football minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions head coach Jim Schwartz gestures during NFL football minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions rookie defensive tackle Ndamukong Suh works out during NFL football minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions tight end Tony Scheffler practices during NFL football minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions tight end Brandon Pettigrew catches a football during NFL minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions wide receiver Nate Burleson catches a football during NFL minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions rookie running back Jahvid Best catches a football during NFL minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions rookie running back Jahvid Best runs downfield during rookie football mini-camp at the team's practice facility in Allen Park, Mich, Friday, April 30, 2010. (AP Photo/Carlos Osorio)

Detroit Lions head coach Jim Schwartz looks over drills during rookie football mini-camp at the team's practice facility in Allen Park, Mich, Friday, April 30, 2010. (AP Photo/Carlos Osorio)

Detroit Lions linebacker Caleb Campbell pushes a tacking dummy during rookie football mini-camp at the team's practice facility in Allen Park, Mich, Friday, April 30, 2010. The Lions got Campbell on the football field two years after they drafted him out of Army. Detroit drafted Campbell in the seventh round of the 2008 NFL draft. On the eve of training camp, he was told not to sign his contract. The U.S. Army revised its interpretation of U.S. Department of Defense policy regarding soldiers playing professional sports, requiring cadets to complete two years of active duty before applying for a release. (AP Photo/Carlos Osorio)

Detroit Lions defensive tackle Ndamukong Suh (90) and safety Sam Scroggins (69) run through drills during rookie football mini-camp at the team's practice facility in Allen Park, Mich, Friday, April 30, 2010. Suh says he has to start off at "ground zero" because being the No. 2 pick in the NFL draft is no longer relevant. Lions coach Jim Schwartz says Suh got his message Friday during the first of a three-day rookie orientation camp. (AP Photo/Carlos Osorio)

Detroit Lions defensive tackles Ndamukong Suh (90) and Demetrius Amos knock a tacking dummy during rookie football mini-camp at the team's practice facility in Allen Park, Mich, Friday, April 30, 2010. Suh says he has to start off at "ground zero" because being the No. 2 pick in the NFL draft is no longer relevant. Lions coach Jim Schwartz says Suh got his message Friday during the first of a three-day rookie orientation camp. (AP Photo/Carlos Osorio)

Detroit Lions wide receiver Calvin Johnson catches a football during NFL minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions guard Rob Sims pauses during NFL football minicamp in Allen Park, Mich., Wednesday, June 23, 2010. (AP Photo/Paul Sancya)

Detroit Lions president Tom Lewand, left, talks with head coach Jim Schwartz during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Matthew Stafford practices during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)

Detroit Lions receiver Mike Moore (17) practices during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)

Detroit Lions quarterback Matthew Stafford practices during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)

Detroit Lions running back Aaron Brown, center, practices during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)

Detroit Lions offensive line coach George Yarno runs with the team during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)

Detroit Lions Dominic Raiola adjusts his helmet during NFL football minicamp at the teams' training facility in Allen Park, Mich., Thursday, June 24, 2010. (AP Photo/Carlos Osorio)