Lions' Green (ankle) won't travel to Michigan

Posted by ESPN.com's Adam Rittenberg

An ankle injury will keep Penn State backup running back Stephfon Green at home this weekend, head coach Joe Paterno said Thursday night.

Green won't travel with the team to Michigan after being unable to practice this week. The sophomore re-aggravated the ankle injury last week against Minnesota after undergoing offseason surgery. Green is Penn State's second-leading rusher this season with 248 yards and three touchdowns on 49 carries.

Sophomore Brandon Beachum will serve as Evan Royster's primary backup against the Wolverines, and Brent Carter will be the third-string back.

Here's Michigan's injury report for the game.