Posted by ESPN.com's Adam Rittenberg
Threet, who has started eight games for the Wolverines, sat out last Saturday's win at Minnesota and continues to be experiencing concussion-like symptoms. Head coach Rich Rodriguez said this morning that Threet is still having some headaches, and his status for Tuesday's practice is unknown.
Minor, who has emerged as Michigan's featured running back, left the Minnesota game with a shoulder injury. Rodriguez isn't sure if Minor suffered a separation but said the junior has soreness in both his shoulder and ribs.
"He's certainly not ready [to play] now," Rodriguez said.
Freshmen Michael Shaw and Sam McGuffie, who is fine after leaving Saturday's game with an injury, would handle the rushing load against Northwestern if Minor can't play. Nick Sheridan would start at quarterback with Justin Feagin backing him up if Threet sits out again. Rodriguez said Threet and Sheridan will split snaps in practice this week if Threet's health improves.
Northwestern also is dealing with injury issues in the offensive backfield. Quarterback C.J. Bacher has missed the last two games with a hamstring injury but could return this week. Third-string running back Stephen Simmons likely will make his second straight start in place of Omar Conteh (knee) and Tyrell Sutton (wrist).