Mike Trumpy finished for season

Northwestern running back Mike Trumpy will miss the remainder of the season after suffering a torn anterior cruciate ligament in his left knee during Saturday's loss to Illinois.

Trumpy, who ranks second on the team with 182 rushing yards on 35 carries, suffered the injury early in the third quarter and had to be carted off the field. Northwestern called it a sprain after the game, but coach Pat Fitzgerald announced Monday that Trumpy has a season-ending tear in the ligament.

Northwestern will turn to Jacob Schmidt, Adonis Smith and Treyvon Green at running back in Trumpy's absence.

Also, starting quarterback Dan Persa practiced Monday and is expected to play this week against Michigan. Persa left the Illinois game after aggravating his surgically repaired right Achilles tendon.

"Dan worked out today and was great," Fitzgerald said Monday. "We expect him to be great on Saturday."

Fitzgerald decided to keep Persa from returning to Saturday's game for precautionary reasons.

"We have to be smart," Fitzgerald said. "We have to err on the side of being smart. It's a marathon, not a sprint."

Persa was 11-of-15 passing for 137 yards and four touchdowns before departing the game.

Adam Rittenberg covers Big Ten football for ESPN.com. He can be reached at espnritt@gmail.com. Information from ESPNChicago.com's Scott Powers was used in this report.