An MRI has confirmed that Northwestern starting quarterback Clayton Thorson has a torn ACL, suffered in the team’s Music City Bowl game against Kentucky. The school released the news on Tuesday afternoon.

Thorson was injured on a trick play in which he was used as a wide receiver. The play worked to perfection, getting the Wildcats into scoring position, but Thorson was unable to leave the field on his own power and needed to be carted off the field.

Northwestern defeated Kentucky 24-23 in the Music City Bowl.

Below is the release from the Northwestern’s Twitter account:

Thorson is a three-year starter for the Wildcats and recently announced that he would return to Evanston for his senior year with the program. He has thrown for over 7,500 yards and 44 touchdowns during his collegiate career.

Northwestern said that Thorson will undergo two to three weeks of prehabilitation before having surgery to repair the torn ACL. No timetable was set for his return.

The Wildcats open the 2018 season against Purdue on Thursday, Aug. 30.

After a modest freshman season, Thorson has been one of the most consistent quarterbacks in the B1G, completing nearly 60 percent of his passes over the last two years. In 2017, He threw for 2,844 yards and 15 touchdowns while leading the Wildcats to a 10-3 campaign. He also accounted for eight rushing touchdowns.

Thorson is already Northwestern’s all-time winningest quarterback, accounting for 27 victories while under center.