Quarterback Lamar Jackson was ruled out for Week 18 by Baltimore Ravens head coach John Harbaugh on Friday.
The Ravens (10-6) visit the Cincinnati Bengals (11-4) with a chance to sweep the season series.
"Lamar's working as hard as he can. The trainers are working as hard as they can," Harbaugh said. "That's where we're at. He won't be playing in this game, we're hopeful for next week."
Backup Tyler Huntley (right throwing shoulder/wrist) was limited in practice on Wednesday and Thursday but said Friday "I have a good chance," to be ready to start Sunday.