Indianapolis Colts quarterback Jacoby Brissett has been diagnosed with a sprained MCL, according to Mike Chappell of Fox 59. The Colts are still awaiting the MRI results to determine the severity of the sprain.

Brissett suffered the injury during the second quarter of his team’s loss to the Pittsburgh Steelers on Sunday. He left the game and did not return. He completed four of his five throws for 59 yards before exiting.

Chappell notes that Indianapolis has not yet ruled out Brissett for its game against the Miami Dolphins next Sunday.

On the season, Brissett has thrown for 1,649 yards, 14 touchdowns and three interceptions while completing 64.8 percent of his passes and posting a passer rating of 99.7.

The 26-year-old was cast into the starting role two weeks before the regular season when Andrew Luck suddenly announced his retirement.

Brissett, who played his collegiate football at North Carolina State, was originally selected by the New England Patriots in the third round (91st pick overall) of the 2016 NFL Draft.

He spent just one season with the Patriots before being traded to the Colts just before the 2017 campaign, as Indy was in need of a signal-caller with Luck sidelined due to a shoulder injury.

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During his first year in Indianapolis, Brissett threw for 3,098 yards, 13 touchdowns and seven picks while completing 58.8 percent of his passes and recording a passer rating of 81.7.

Luck returned to the starting role last year.

The Colts are now 5-3 on the season and are a half-game behind the Houston Texans for first place in the AFC South.