ISU quarterback Austen Arnaud has a torn ACL and MCL after an MRI on Monday afternoon confirmed what team doctors initially thought the injury to be.

Arnaud was injured in the fourth quarter of Iowa State’s 34-14 loss to Colorado on Saturday.

ISU coach Paul Rhoads relayed the test’s prognosis on Tuesday night and said that the senior from Ames will undergo knee surgery after Thanksgiving.

The injury will keep Arnaud out of Saturday’s game against Missouri in what would have been his final game as a Cyclone. If Iowa State wins, it becomes bowl eligible for the second-straight season, but the severity of the knee injury would likely keep Arnaud out through bowl season as well.

Arnaud will finish his career as the second-leading passer in ISU history with 6,777 yards and first all-time with a 59.7 percent completion rate through three years as the Cyclones’ starter.