Left guard Mike Iupati took part in every practice this week and is listed as questionable on the team's injury report. "Still a possibility," Jim Harbaugh, always eager to keep injury news vague, said of Iupati playing Sunday against the Buccaneers.
If Iupati, who sprained his left MCL on Nov. 17, cannot play, Adam Snyder would make his fourth straight start at left guard. Cornerback Tarell Brown (ribs) also is listed as questionable, as is receiver Mario Manningham (knee), who has not caught a pass in the last two games. Tramaine Brock is likely to start at right cornerback in place of Brown.
Receiver Michael Crabtree and running back Frank Gore practiced in full on Friday. Both are dealing with ankle injuries and are listed as probable on the injury report.
CB Tarell Brown (ribs), G Mike Iupati (knee), WR Mario Manningham (knee), TE Vance McDonald (ankle)
WR Jon Baldwin (shoulder), WR Michael Crabtree (ankle), S Craig Dahl (ankle), RB Frank Gore (ankle), DT Ray McDonald (ankle), LB Dan Skuta (foot), LB Aldon Smith (shoulder), DT Justin Smith (shoulder), G Adam Snyder (not injury related), T Joe Staley (knee)
DE Da'Quan Bowers (knee), LB Lavonte David, DE William Gholston (head), DT
Gary Gibson (calf), WR Vincent Jackson (hamstring), G Davin Joseph (knee, shoulder), DT Akeem Spence (wrist), C Jeremy Zuttah (shoulder).
G Carl Nicks (foot)
-- Matt Barrows