Mixon (concussion) has been ruled out for Sunday's game against the Bears, Katherine Terrell of ESPN.com reports.
Mixon missed the entire week of practice after suffering a concussion in the first half of Monday's 23-20 loss to the Steelers. His absence sets up Giovani Bernard for a workhorse role in Week 14, with rookie fifth-round pick Brian Hill representing the only other healthy tailback on the roster. The Bengals likely will sign another running back before Sunday to offer depth behind Bernard and Hill, potentially turning to Jarveon Williams from their practice squad.