via ESPN 
Oregon’s Marcus Mariota, who took a hard hit to the head in this past weekend’s 42-16 loss to Arizona, says he has passed all the concussion tests and will play in Friday afternoon’s Civil War game against Oregon State.
However, there are still lingering questions about the health of his left knee as the No. 13 Ducks prepare to host the Beavers in the annual rivalry game.
Mariota said he got his “bell rung” while trying to tackle Arizona’s Shaquille Richardson on an interception late in the loss to the Wildcats.Ducks' Mariota Ready To Go After Hit by Sports Talk Florida