Buccaneers quarterback Jameis Winston‘s injury to his throwing shoulder continues to hamper him, in part because he re-injured it last Sunday in Buffalo.

Via JoeBucsFan.com, Bucs coach Dirk Koetter revealed on SiriusXM NFL Radio that a sack-fumble in the second quarter against the Bills resulted in the re-injury. Koetter also said Winston has a bruised deltoid muscle.

Winston initially suffered the injury during the Week Six game at Arizona.

Koetter connected the re-injury to the fact that Winston didn’t throw in practice until Friday. He’s officially listed as questionable for Sunday’s game against the Panthers, but Koetter said Winston will start.