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Ravens coach John Harbaugh confirmed that rookie linebacker Teddye Buchanan, who earned a starting role in Week 2, has suffered a torn ACL in his right knee and will miss the remainder of the season.

Buchanan was carted to the locker room at the end of the first quarter against the Cincinnati Bengals on Sunday.

Sources told The Banner on Sunday he was expected to undergo an MRI on Monday for a suspected ACL tear. Harbaugh confirmed the tear Monday.

“Teddye did a great job,” Harbaugh said. “Just to see his progress, see him grow as a player on defense and special teams has just been really fun. Nobody’s into it more than he is. He’s just great.”

Buchanan sustained the injury on a noncontact play while in punt protection.

He was on the ground writhing in pain, bringing the trainers out. His defensive teammates kneeled around him, with his mentor and fellow inside linebacker Roquan Smith running to kneel by his head.

“It’s tough anytime you see your guy go down,” Smith said, “somebody you go to war with every day and truly just a good dude — it gives me chills just thinking about it. ... There’s not much I can say in the moment outside of just that I’m there for him.”

Buchanan walked off the field with a trainer supporting him on each side. A cart came to pick him up on the sideline and drive him to the locker room.

After the game, Buchanan was sitting in the locker room with his right leg elevated and a brace around it. His teammates were checking in on him and volunteering to help him get his stuff out to the plane.

“That’s tough,” safety Kyle Hamilton said. “A rookie who’s been balling. I think that’s three rookie linebackers who have gone down with knee injuries. Football is weird like that sometimes.”

Linebackers Jay Higgins and Chandler Martin have both suffered major injuries, leaving the position group thin.

Smith said Buchanan is a “strong-minded individual,” and Hamilton said he knows he’ll come back strong.

“He’s going to be back next year, should be back hopefully for training camp, ready to go, ready to build on what he’s done,” Harbaugh said. “It’s unfortunate, disappointing. It will be part of his story moving forward.”

The loss of Buchanan is significant. He has 93 tackles (including two Sunday), five tackles for loss, two quarterback hits, half a sack and a forced fumble.

Harbaugh expressed confidence in Trenton Simpson’s ability to fill in. Hamilton also shouted out Simpson for stepping in after Buchanan’s injury.

“Trenton had a really good game, played well, has been practicing great,” Harbaugh said. “Every time he’s been playing, he’s been playing well, too. ... He’s played great. He’s played good against the run, good against the pass in the reps he had. Really not worried about it at all.”

In other injury news, cornerback Chidobe Awuzie’s foot injury is not considered serious, Harbaugh said Monday. Awuzie left the locker room Sunday in a boot.

“We’ll know more as the week goes on,” Harbaugh said. “It’s not like a Lisfranc or anything like that. ... He was covering that seam route by [tight end Mike] Gesicki and did a great job on the play. Then as he finished up, he got his foot caught in the netting, was kind of laying on the ground over by the field goal back netting, got caught up in that and kind of grabbed his foot a little bit.”

Awuzie, who’s been limited by injuries in recent years, has been perhaps the Ravens’ most consistent cornerback this season. Playing as a rotational outside cornerback, he’s allowed 22 catches on 43 targets for 250 yards and one touchdown when targeted in coverage, according to Pro Football Focus.

T.J. Tampa replaced Awuzie in the game.

Harbaugh also provided an update on left tackle Ronnie Stanley, who left the field in pain in the fourth quarter.

“He’s sore, like a lot of the guys. ... Three weeks left, there’s different little things,” Harbaugh said. “He’s another guy we’ll be looking at through the course of the week.”

This story has been updated.