CORVALLIS — Oregon State quarterback Darell Garretson has been ruled out for the season.

Garretson injured his ankle during the Beavers' 19-14 loss to Utah on Saturday.

Second-string QB Conor Blount stepped in for Garretson but was knocked out with a knee injury a few plays later. Blount will not be able to play this week at Washington and his status after that is to be determined.

Marcus McMaryion then led the Beavers on their second touchdown drive and finished with 76 yards on 5 of 9 passing with the TD. McMaryion will start at UW.

"We never say anything about injuries and the only time I ever respond to any injuries is if somebody's out for the season, and that's the case with Darell up to this point for the regular season," OSU coach Gary Andersen said Monday.

"We expect Marcus to come in and be the starter this week without question and we'll move from there and see what takes place."

That leaves two healthy QBs on the roster, McMaryion and freshman Mason Moran, who has been working on the scout team.

Former Utah State quarterback Chuckie Keeton, now Oregon State's recruiting and operations assistant, will serve as the scout-team quarterback to allow Moran to get reps in with the second and third team players.

Seth Collins might get some snaps at QB as well.

"We'll see. Whatever comes our way, comes our way," Andersen said. "Mason will be up there and take some snaps. You guys will see that as the week goes on. We've got to get our best guys on the field in the best situation, so I don't think it's going to be any surprise attack if Seth plays more quarterback than he's done in the past. So we'll see where it takes us."

Passing problems

The remaining quarterbacks will look to improve what has been a woeful passing game for the Beavers.

Garretson had 1 yard through the air after three quarters on Saturday and finished 4-for-20 for 24 yards and an interception.

As a team, OSU is last in the Pac-12, averaging 146 yards a game.

"We all know, it's not a secret, we are horrible at throwing the football," Andersen said. "And again, that starts with me. I am a horrible coach when it comes to throwing the football this year for those kids. So I need to try to help (the quarterback) and every coach does and every player also."

On the Huskies

The Beavers now get what most likely will be their toughest test of the season in a road trip at No. 5 Washington.

"It's a great opportunity for us to play against another nationally-ranked team," Andersen said. "Last week we were a play away from beating a nationally ranked team and didn't get it done. So we're looking forward to an opportunity to compete again against a very, very talented team in the Pac-12."

Andersen said the Huskies are the best team he's seen since arriving at OSU.

"They are very dominant for most of the time in the games that they're in," he said. "They're dominant physically, they're dominant from the speed standpoint, the quarterback is very, very good at handling the offense, yes, making the plays when they need to, yes, good touch on the ball, yes, can throw from the opposite hash, yes. And he's got very talented players that he's throwing to, that he's handing off to."