Lamar Jackson suffered a sprained ankle in Cleveland, knocking him out of the game and leaving his status for the upcoming week in question.
"Lamar has an ankle sprain. We'll look at it more tomorrow and see where we're at," Head Coach John Harbaugh said.
Jackson exited the game in the second quarter and was ruled out as the second half began. He was hit low by Browns rookie linebacker Jeremiah Owusu-Koramoah after throwing a pass as Jackson rolled to his right.
Jackson got up limping and slowly went off the field. He was immediately carted to the locker room.
Asked whether Jackson will need more tests, Harbaugh said, "We'll see how it responds tomorrow."
Losing Jackson is a brutal blow for an already injury-decimated Ravens squad on both sides of the ball. Though Jackson has been in the midst of the toughest stretch of his career, he has carried Baltimore's offense for much of the year.
"That's our brother. I remember Sammy [Watkins], right after it happened, in the huddle was like, 'Let's go play for Lamar,'" tight end Mark Andrews said. "That's our brother. We've been through a lot for him. Obviously, I'm just praying for him, hoping he's going to be alright, hoping he's going to be healthy."
Before he went to the sideline, the Ravens offense got off to another slow start. Jackson was 4-of-4 for 17 yards and had two carries for five yards and Baltimore fell into an early 10-0 deficit.
Backup quarterback Tyler Huntley replaced Jackson and got the offense moving. Huntley finished the game 27-of-38 for 270 yards and one touchdown, but two fumbles – one returned for a touchdown and one deep in scoring territory – proved especially costly.
Multiple Ravens players and Harbaugh expressed their confidence in Huntley to win versus Green Bay next week if needed.
Jackson wasn't the only injury the Ravens suffered in the game. Top defensive lineman Calais Campbell (thigh) went to the sideline in the first quarter and did not return. Wide receiver Tylan Wallace (concussion) was also ruled out.