Backes was removed from Tuesday's game against the Stars with an upper-body injury and will not return. Backes fell hard and appeared to hit his head on the ice during the first period of action. He remained down on the ice for a while before finally ambling to his feet and heading to the locker room. He'll more than likely be evaluated for a possible concussion over the next 24 hours, putting his status in peril for the Blues' critical showdown with the Ducks on Thursday.