Bush is dealing with an injury to his ribs. he played only two snaps in Week 14 while trying to fight through the injury. Matt Forte, meanwhile, is healthy and ready to play. He'll get the bulk of the work.
Fantasy Impact: Michael Bush had a chance to be a fantasy factor when Matt Forte was dealing with injuries, but Bush is now the one who can't stay on the field. He is a talented back, but this injury will limit his fantasy value for the rest of the season.
He's not worth rostering at this point, with the fantasy season hanging in the balance.