Notre Dame coach Charlie Weis injured his left leg during the Michigan game when an Irish player was blocked into him during a punt return late in the second quarter.
Weis said after the game his knee is "blown out" and that he tore his ACL and MCL.
"I feel like at athlete, first time in my life," Weis said. "Tommy Brady's got nothing on me."
Irish defensive end John Ryan, who is 6-5, 264 pounds, hit Weis in the leg. Weis, who was looking the other direction, never saw the hit coming and was knocked to the ground. Weis remained on the sideline on crutches with his leg in a wrap for the rest of the half.
"I was following the ball down the field there was nothing I could do, nothing they could do," Weis said as he left the field before halftime.