CORVALLIS, Ore. -- Dr. Doug Aukerman, the Beavers team physician, confirmed on Tuesday that Sean Mannion will need surgery to repair the meniscus in his left knee.
Mike Riley said the surgery is expected to be done Wednesday morning in Corvallis.
Following the procedure, Mannion's playing status will be week-to-week, although the normal recovery time is roughly 3-5 weeks.
"He's great in the weight room, he's great in the training room, so I would anticipate him being back as fast as possible," said offensive coordinator Danny Langsdorf. "But I think it all depends on how that surgery goes and what they find in there."
Mannion will be replaced by junior Cody Vaz, who has limited game experience with the bulk of it coming against Stanford in 2010. But Riley insists that the playbook won't change with Vaz under center.
"He knows everything we do," said Riley. "He practices it all. He's always been ready. We don't need to tear the thing down for him."
"You can't simulate the game very well, but he knows what we're doing," said Langsdorf. "We're not changing out plan, our scheme, or anything like that.
He's played in a ton of scrimmages, had a lot of practice reps."