"We are very disappointed for Casiem," Villanova coach Jay Wright said on Monday. "He has struggled with injuries all season and now he has incurred a new one. We are proud of his toughness and commitment. We all will support him in overcoming this latest injury."
Drummond made nine starts in 21 games and averaged 4.9 points and 4.5 rebounds per game.
The Wildcats play Kansas in the regional semifinals on Friday.