"Jim Harbaugh said Sunday that "it's possible" receiver Michael Crabtree, recovering from a broken foot, could return to practice this week. However, Crabtree is still unlikely to play in Thursday's preseason finale against the Chargers and his status for the regular-season opener Sept. 11 also is unknown.

According to a source, Crabtree fractured his left foot during a player-run practice at San Jose on June 6. Crabtree had surgery on the foot prior to the start of training camp and was placed on the physically unable to perform list. He is still on the PUP list.

Crabtree suffered a stress fracture to the same foot likely during his senior season at Texas Tech. That injury was discovered during the scouting combine in February 2009. Crabtree had surgery the following month during which a screw was inserted into the foot. It's not known whether the recent surgery also included the insertion of a screw."