Summary: Receiver Michael Crabtree, who sat out the final 20 minutes of practice Friday with an apparent right ankle injury, was held out of Saturday's work. His injury is not believed to be serious, but it is not known when he is expected back on the practice field. Crabtree did not take part in any portion of practice.
In Crabtree's absence, rookie receiver A.J. Jenkins had a busy day. During the 11-on-11 session, Jenkins made three catches, including a nice grab to end practice. On a previous play, Jenkins failed to hang onto a Scott Tolzien throw that was behind him. But Jenkins made the catch in traffic a short time later on a dart from second-string quarterback Colin Kaepernick.
Injury report: Crabtree did not take part in any portion of practice. Team spokesman Bob Lange, apparently relaying word from coach Jim Harbaugh, acknowledged Crabtree "is working through something." . . . Linebacker Tavares Gooden left practice an hour early with a member of the team's training staff. Gooden did not appear to be injured . . . Guard Joe Looney (foot) and running back Jewel Hampton are on the non-football injury list, while outside linebacker Darius Fleming (knee) is on the physically-unable-to-perform list.
Eye on reps: Will Tukuafu spent the practice at fullback, while Demarcus Dobbs returned to the defensive line after spending the first practice at tight end.
Notable: Quarterbacks Colin Kaepernick and Josh Johnson threw the ball more accurately than the previous day. Receivers Ted Ginn, Kyle Williams and Nathan Palmer made nice catches. Receivers Randy Moss and Brett Swain, and tight end Nate Byham dropped passes. Defensive backs Donte Whitner and Tarell Browm broke up pass attempts.
Quotable: "It'll be pretty easy for all of you to pick out 40 guys that make this team. It's that last five that are hard decisions. And then it becomes the factor of the numbers at other positions. Last year, we kept seven (defensive linemen) because we had seven that we liked and we didn't want to expose any of them to the waiver system. We had two young guys in Dobbs and (Ian) Williams that we felt if we didn't keep we might lose them. So, that was part of the thought process there to keeping seven." --49ers defensive coordinator Vic Fangio.
Next practice: The 49ers return the practice field Sunday for their first full-squad workout with pads. The 49ers are scheduled to practice from 2:30 to 5:10 p.m. None of the 49ers' practices in Santa Clara this summer are open to the general public due to the ongoing stadium construction.