Jacoby Brissett left Sunday's game against the Pittsburgh Steelers with a left knee injury.
Brissett was hurt early in the second quarter. Frank Reich told reporters after the Indianapolis Colts' loss that he believes the quarterback's injury is a sprain and possibly "MCL-ish."
"I think it looks like a sprain, but we'll see to what degree," Reich said. "We have to see how it responds."
Brian Hoyer replaced Brissett at quarterback.