The Bears put guard/center Ryan Bates on injured reserve with a concussion Saturday and promoted running back Darrynton Evans to the active roster for Sunday’s game against the Lions at Soldier Field.
The Bears also listed center/guard/fullback Doug Kramer as questionable for the Lions game with a shoulder injury.
Bates already had been ruled out for the Lions game — his sixth consecutive game missed since suffering the concussion after seven plays against the Packers on Nov. 17 at Soldier Field. Kramer has backed up at left guard and center this season, and also played fullback in goal-line situations.
The Bears already are shaky on the offensive line with left tackle Braxton Jones (concussion) and left guard Teven Jenkins (calf) questionable for the Lions game. Jones practiced in full on Friday and interim coach Thomas Brown was optimistic he would be able to play.
Jake Curhan has played left guard for Jenkins against the 49ers and for Bates against the Packers and likely would start if Jenkins can’t play.