What happened: Quarterback Marcus Mariota exited Sunday's game with a knee injury and is questionable to return. The veteran went to the locker room following a sack in the first quarter.

Why it matters: Mariota was already making the start in place of Jayden Daniels, who remains sidelined with an elbow issue. The development forces third-string signal-caller Athan Kaliakmanis into action.

What to watch: Medical staff will continue to evaluate the knee to determine his availability for the remainder of the contest.