Michigan defensive tackle Ondre Pipkins will miss the rest of the season after tearing an anterior cruciate ligament in one of his knees during Saturday's win over Minnesota.
The team announced the loss Monday. Pipkins, a sophomore, had appeared in all five games, totaling seven tackles.
The 18th-ranked Wolverines play at Penn State on Saturday.
Michigan is allowing opponents to convert 41 percent of their third-down plays, ranking them just 78th among Bowl Subdivision teams.
In Michigan's 42-13 win against Minnesota last weekend, the Golden Gophers were 8 of 15 on third-down conversions and put together scoring drives of 16, 11 and nine plays that ate up more than 20 minutes of game time.