Utah State junior quarterback Chuckie Keeton will miss the rest of the season after injuring his left knee Friday night in the first quarter of the Aggies' home loss to BYU.
Keeton tore his anterior cruciate and medial collateral ligaments. He will have surgery in the next week.
Keeton was 136 of 196 for 1,388 yards with 18 touchdowns and only two interceptions this season. He also rushed for 241 yards and two TDs on 55 carries for the Aggies (3-3).
Craig Harrison took over after Keeton was hurt. He threw a late TD pass in Utah State's 31-14 loss.