Notre Dame starting left tackle Anthonie Knapp has been ruled out for the College Football Playoff national championship game against Ohio State with a high ankle sprain, coach Marcus Freeman said on Sunday.The seventh-seeded Fighting Irish and eighth-seeded Buckeyes will square off on Jan. 20 in Atlanta.Knapp sustained the injury in Notre Dame’s 27-24 win against Penn State in the Orange Bowl on Thursday.”We have a week of preparation to make sure we have the right guys to start this game,” Freeman said, “and we’ll see what that is here in the next couple of days.”