Defensive end Chris Long (thigh) and right tackle Jason Smith (ankle) are both active and expected to start for the Rams despite their injuries. Tight end Mike Hoomanawanui, given only an outside shot at returning this week, was among the Rams' inactive players.
Also inactive for the Rams: safety Michael Lewis, cornerback Justin King, linebacker David Nixon, linebacker Curtis Johnson, guard John Greco, receiver Mardy Gilyard and defensive tackle Jermelle Cudjo.
The 49ers will play without third tight end Nate Byham (heel), who was named inactive along with cornerback Tramaine Brock, cornerback William James, safety Chris Maragos, defensive tackle Will Tukuafu, tackle Joe Staley and tackle Alex Boone. David Carr is the third quarterback.
Staley made the trip, as did former starting center Eric Heitmann, who is on injured reserve. They were walking laps around the field during early warm-ups. The 49ers could get Staley back from a broken fibula as early as Week 17. Barry Sims will start in his place again Sunday.