Lamar Jackson left the playing field early Sunday and did not return.
The Ravens' star quarterback was carted to the locker room soon after taking a hit to the lower body from a Browns defender early in the second quarter. He was originally designated as questionable with an ankle injury before being downgraded to out coming out of halftime, forcing him to watch from the sidelines as Baltimore's rally fell short in a 24-22 loss.
Coach John Harbaugh said afterward that Jackson suffered a sprained ankle and will undergo further testing Monday to determine the severity.
Backup QB Tyler Huntley played nearly three full quarters for Baltimore, which trailed 10-0 at the time of his entrance. Jackson completed all four of his passing attempts for 17 yards, but his offense punted on their first three possessions. Huntley completed 27 of 38 attempts for 270 yards and a touchdown and rushed for 45 yards.
The Ravens scored 19 unanswered points after falling behind 24-3 in the second quarter, but they turned the ball over on downs with a chance to win in the final minute after recovering an onside kick.
The rally marked progress for Baltimore's offense, which hadn't topped 20 points since Week 9. Jackson in particular has struggled of late but remains one of the more impactful players in the league, putting his team in position to win on an almost-weekly basis. The former MVP came into Week 14 with twice as many rushing yards as his next-closest teammate.
The Ravens (8-5) still hold a one-game lead in the AFC North, with all four of their remaining games coming against teams with a record of .500 or better (Packers, Bengals, Rams, Steelers).