Michigan star tailback Blake Corum is expected to attempt to play against Ohio State on Saturday, sources told ESPN, as an air of ambiguity hangs over his potential effectiveness because of a knee injury.

Corum, one of the leading candidates for the Heisman Trophy, injured his knee late in the first half against Illinois last week. Michigan coach Jim Harbaugh called Corum's left knee "structurally good" following the Wolverines' 19-17 win, but Corum returned for only two plays in the second half before being pulled for the remainder of the game. He carried the ball just one time after the injury and did not play during the Wolverines' fourth-quarter comeback.

Sources said Corum isn't expected to be 100% in the wake of the injury, and the number of carries he will receive and his general effectiveness when he does get the ball are questions lingering over his return. While Corum has traveled and will dress, it's not expected that he will be able to flash the top form that has him tied for No. 1 nationally in touchdowns scored (19) and No. 4 in rushing yards (1,457).