SANTA CLARA -- The 49ers classified cornerback Tramaine Brock and offensive tackle Anthony Davis as “questionable” on their injury report today. But neither practiced this week and it’s unlikely that either plays Sunday against the Bears.
Brock is dealing with a sprained big toe suffered Sunday in Dallas. Perrish Cox would step in if Brock can’t play. Jonathan Martin is in line to start at right tackle for Davis, who is dealing with a hamstring strain.
Meanwhile, the team’s other cornerback starter, Chris Culliver, has passed every post-concussion test to date. The remaining step is the so-called “simulated contact” test that likely will be administered Saturday.
“Right on schedule, should be good to go,” Jim Harbaugh said of Culliver.
If Culliver does not pass that step, Chris Cook or rookie Dontae Johnson would start at the other cornerback spot.
The 49ers cornerbacks’ opponents also remain fuzzy. Bears receiver Alshon Jeffery (hamstring) practiced for the first time this week and is listed as questionable for Sunday’s game. Teammate Brandon Marshall (ankle) did not practice this week and may be a game-time decision. Josh Morgan (groin) is doubtful for the game.
The Chicago Tribune reported that Santonio Holmes was the only receiver on the squad who practiced all week.