San Francisco 49ers linebacker Ahmad Brooks smiles during practice at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receiver A.J. Jenkins practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receiver Michael Crabtree practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers linebacker Cam Johnson practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receiver Mario Manningham practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers linebackers Aldon Smith (99) and Ahmad Brooks (55) practice at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers running back Frank Gore practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers kicker David Akers watches practice at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receiver Randy Moss practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers linebacker Patrick Willis (52) practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers head coach Jim Harbaugh gestures as his team practices at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receivers Michael Crabtree (15) and Randy Moss (84) practice at an NFL football training camp in Santa Clara, Calif., Tuesday, Aug. 7, 2012. (AP Photo/Jeff Chiu)

In this Tuesday, Aug. 7, 2012, photo, San Francisco 49ers cornerback Cory Nelms practices at an NFL football training camp in Santa Clara, Calif. Nelms ran off the field in the middle of the 49ers' practice on Wednesday to go watch a television broadcast of his girlfriend T'erea Brown in the final of the 400-meter hurdles at the 2012 Summer Olympics in London, watching the fellow American finish sixth after posting her personal best in the semifinals. (AP Photo/Jeff Chiu)