Fields walked back to the locker room early in the third quarter after first being examined in the blue medical tent. It’s unclear on which play Fields suffered the injury; the first-round draft pick was hit often by the Baltimore defense.
Fields took a sack on his final drive but stayed in the game for four more plays.
Fields finished the afternoon 4-of-11 for 79 yards with a lost fumble.
Veteran Andy Dalton replaced Fields and promptly threw a 60-yard touchdown pass to wide receiver Darnell Mooney. Dalton lost the starting job to Fields after he suffered a knee injury in Week 2 against the Cincinnati Bengals.