Washington Commanders backup quarterback Marcus Mariota has a sprained medial collateral ligament in his right knee, coach Dan Quinn confirmed on Sunday.⁠ ⁠ Mariota, 32, will miss the remainder of the preseason, but Quinn is “optimistic that he’ll be ready for the start of the regular season.”⁠ ⁠ Mariota was injured during Washington’s preseason opener against Miami on Friday night. Starter Jayden Daniels did not play against the Dolphins.⁠ ⁠ Quinn said the Commanders don’t plan on bringing in another quarterback at this time. The only other QBs on the roster are Sam Hartman and rookie Athan Kaliakmanis.⁠ ⁠ “It will allow more reps over the next couple of weeks with Sam (Hartman) and Athan (Kaliakmanis) in that spot,” Quinn said.⁠ ⁠ See updates at our #linkinbio.⁠ ⁠ #WashingtonCommanders #NFL⁠