EUGENE -- Oregon's quarterback and top receiver are in concussion protocol and their status for this week's game vs. UCLA is undetermined.
"Dillon Mitchell and Justin Herbert are both in concussion protocol," Oregon coach Mario Cristobal said.
Mitchell left Oregon's 44-15 loss at Arizona following a brutal hit by Wildcats safety Tristan Cooper on a third-and-eight pass from Oregon's 37-yard line during the third quarter.
Mitchell, who had six catches for 69 yards and a touchdown in the loss, was down on the field for several minutes but got up under his own power.