Bears star outside linebacker Khalil Mack will undergo foot surgery next week and will miss the remainder of the season.
The six-time Pro Bowler suffered the injury in a Week 3 loss in Cleveland. Mack played in the Bears' next four games—recording three sacks—despite being either limited or held out of practice entirely. He then sat out back-to-back contests against the 49ers and Steelers heading into the bye week.
"With him, it's been the last several weeks just trying to get right," said coach Matt Nagy. "I think we did everything as far as trying to attack it the right way with him, and I know he's put a lot of time and energy in trying to get back and see where things are at. But this is where we're at.
"I know he's frustrated because he's such a competitor. But this is the best thing for him and the best situation to be able to help him out and get it fixed."
In seven games this season, Mack recorded 19 tackles, 6.0 sacks and six tackles-for-loss. His 6.0 sacks in the first six contests were the most in his eight-year NFL career in the first six games of a season.
Mack will join another veteran linebacker on injured reserve in Danny Trevathan, who was placed on IR Friday. After missing the first four games this season with a knee injury, the 10-year veteran appeared in the last five contests, registering 19 tackles. Because Trevathan was already activated from injured reserve once this year, he's ineligible to play the rest of the season.
In other injury news, defensive tackle Akiem Hicks has been ruled out of Sunday's home game against the Ravens with an ankle injury that prevented him from practicing all week.
The Bears likely will also be without receiver Allen Robinson II, who is listed as doubtful on the injury report. Robinson hurt his hamstring in the Bears' last game, Nov. 8 against the Steelers, while making a key 39-yard catch on a late go-ahead touchdown drive. He was unable to practice all week as well.
Running back Damien Williams was a full participant in practice Thursday and Friday, but was downgraded to doubtful on Saturday with a calf injury.
Safety Eddie Jackson (hamstring) was limited in practice Friday for the second straight day and is listed as questionable. Jackson was injured Oct. 31 on the second play of a loss to the 49ers at Soldier Field and then sat out the Steelers game.
Reserve tackle Elijah Wilkinson (back) returned to practice Friday on a limited basis and is also listed as questionable.
Deon Bush was activated off injured reserve Saturday and will play against the Ravens. Nagy said Friday there was a "strong possibility" that the safety would return after missing the last three games with a quad injury he sustained Oct. 17 in a loss to the Packers at Soldier Field.