Michigan offensive lineman Chris Bryant will miss the season because of a fractured leg, and linebacker Kaleb Ringer will redshirt following knee surgery.
The athletic department announced their absences Thursday, saying only that Bryant had a fractured tibia and Ringer recently had his operation.
Bryant redshirted last season after signing with the Wolverines out of Simeon High School in Chicago.
Ringer signed this year out of Northmont High School in Clayton, Ohio.
The eighth-ranked Wolverines open the season against second-ranked Alabama on Sept. 1 at the Dallas Cowboys' home stadium.