Briggs (knee) and Pace (groin) were injured in Chicago's loss last week at Minnesota. The Bears were also without tight end Desmond Clark (neck) for a third straight game.
Guard Richie Incognito was back for the Rams after missing four games with a sprained ligament in his right foot. Adam Goldberg was at right tackle for Jason Smith, who is sidelined by a concussion.
Rams running back Steven Jackson, who had been questionable with a sore back, was active.
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