Chris Allen suffered a groin injury in Michigan State's 78-62 win over Northwestern Thursday and sat out most of Friday's workout. Coming off one of the best nights of his young career — 17 points on 4-of-5 3-point shooting — he'll be sorely missed if he's limited Sunday against Michigan. The freshman guard missed four games earlier this year with a bruised foot.

"That's kind of disappointing after having a good game, but (how bad the injury is) I don't know," MSU coach Tom Izzo said. "It's not where we're cutting his leg off, but it's also bad enough where he couldn't practice (Friday)."