Coach Bronco Mendenhall announced the injury after practice Monday as the team geared up to play No. 10 Oregon State, which will be without starting QB Sean Mannion because of knee surgery.
BYU senior Riley Nelson says he is ready, pain-free and will start against the Beavers after missing two games with what he said were "back fractures."
Hill passed for 425 yards this season and rushed for 336, with 8 TDs. His injury occurred on a 4-yard run even though coaches were trying to get him to take a knee.
Copyright 2012 The Associated Press.