Oregon senior Chris Boucher suffered a torn ACL and will miss the remainder of the season, the university announced.
The injury occurred in the first half of Friday night's Pac-12 semifinal win over Cal. Boucher finished the game with 10 points and two blocks.
It will require surgery at a later date.
Boucher was averaging 11.8 points, 6.1 rebounds and 2.5 rebounds off the bench.
Oregon will turn to Kavell Bigby-Williams and Roman Sorkin in Boucher's absence. The Ducks take on Arizona for the Pac-12 tournament championship at 11 p.m. ET on Saturday. The NCAA tournament bracket will be revealed on Sunday.