Oregon State starting quarterback Darell Garretson will miss the remainder of the season with a broken ankle and backup Conor Blount will be out against No. 5 Washington on Saturday with a knee injury, the school confirmed Monday.

The injuries to Garretson and Blount occurred on back-to-back possessions in the Beavers' 19-14 loss to Utah on Saturday.

Oregon State quarterback Darell Garretson is done for the season. Christopher Hanewinckel/USA TODAY Sports

With neither quarterback available, the Beavers will turn to third-string sophomore Marcus McMaryion, who completed 5 of 9 passes for 76 yards off the bench against Utah. McMaryion played in seven games last season and started the season finale against Oregon.

Garretson, a redshirt junior, transferred to Oregon State from Utah after the 2014 season. He was named the Beavers' starting quarterback after spring practice and completed 73 of 146 passes for 617 yards in six starts this season. Blount, a true freshman, has completed 19 of 35 passes for 183 yards in three appearances.

ESPN.com staff writer Chantel Jennings contributed to this story