"It appears Michael Crabtree and training camp won't be seeing much of each other for the third straight season.

According to the Sacramento Bee, the foot injury the 49ers' third-year wide receiver sustained during the team's players-only offensive minicamp in early June will force him to miss four to six weeks of training camp, which opened Thursday. The team has placed Crabtree on the physically unable to perform list. He can be activated at any time prior to Sept. 3, when rosters must be reduced to 53 players.

Crabtree, who has never played in a preseason game due to a contract holdout in 2009 and a neck injury last year, had surgery to correct a stress fracture in his left foot prior to the draft in 2009. His current injury is to the same foot.

Crabtree's injury explains why the 49ers were among the teams granted permission to work out a potential trade with Bengals wide receiver Chad Ochocinco, according to the Boston Herald. However, the Patriots acquired Ochocinco on Thursday."