Ohio State quarterback Braxton Miller reinjured his right shoulder Monday, according to a report by the Columbus Dispatch.
Miller, a senior, underwent minor surgery on the shoulder in February and the team had been moving him along slowly in his recovery.
He threw for 2,094 yards and 24 touchdowns, and ran for another 12 scores in leading the Buckeyes to the Discover Orange Bowl last season.
Ranked fifth in the preseason AP poll released Sunday, Ohio State is expected to be in the national title conversation and Miller a Heisman Trophy candidate.
The Buckeyes open their season Aug. 30 at Navy.