The Bears on Saturday placed guard/center Ryan Bates on injured reserve and signed running back Darrynton Evans off the practice squad.
Bates has been sidelined since suffering a concussion Nov. 17 against the Packers.
Evans was signed to the Bears practice squad Nov. 26 and has appeared in the last two games, rushing for three yards on three carries and playing 15 snaps on special teams.
Evans is expected to fill in for running back Travis Homer, who is listed as doubtful on the injury report with a hamstring injury he sustained in practice Friday.