San Francisco's key rush linebacker Aldon Smith will play after being limited in practice all week with a shoulder injury.
All four of San Francisco's starting linebackers are listed on the injury report with varying degrees of participation in practice.
LBs NaVorro Bowman and Patrick Willis participated fully all week with shoulder injuries. Aldon Smith (shoulder) and Ahmad Brooks (shoulder) were limited in every practice this week, but are expected to play Sunday against Baltimore.
Smith, arguably the best pass rusher playing in the game, is bolstered by the presence of defensive end Justin Smith, who is also expected to play despite an elbow/triceps injury.
Running backs Frank Gore (shoulder, ankle) and LaMichael James (finger) will play. Plowing their way, All-Pro left guard Mike Iupati (shoulder) is expected to play as well.
Cornerback Tarrell Brown (shoulder), LB Clark Haggans (shoulder), tight end Garrett Celek (foot) and fullback Bruce Miller (shoulder) are all on the injury report, but all are expected to play.
The 49ers are 3.5-point favorites against the Ravens. The game kicks off at 3:30 p.m. PT Sunday from New Orleans.