The Detroit Lions downgraded center Travis Swanson to out for Saturday night's wild-card playoff game in Seattle against the Seahawks.
Swanson will miss his fifth straight game with a concussion. The Lions previously listed Swanson as questionable.
Third-round rookie Graham Glasgow will start again at center in place of Swanson.
Linebacker DeAndre Levy (knee), offensive tackle Riley Reiff (hip) and returner/wide receiver Andre Roberts (shoulder) were listed as questionable on Friday's injury report for the Lions (9-7).
For the Seahawks (10-5-1), running back C.J. Prosise (shoulder) and defensive tackle Tony McDaniel (concussion) were ruled out.