A person with knowledge of the situation says Michigan State coach Mark Dantonio had a heart attack after his team's overtime victory against Notre Dame.
The person spoke to The Associated Press on condition of anonymity Sunday because the school planned to make an announcement at a news conference later in the day.
The person said that Dantonio had a stent put in a blocked artery near his heart after the victory over Notre Dame on Saturday night. The Spartans used an audacious fake field to win 34-31.
Dantonio will be out indefinitely and offensive coordinator Don Treadwill will coach in his absence.
AP Sports Writer Larry Lage reported from Detroit.