ENGLEWOOD, Colo. —Outside linebacker Bradley Chubb is "truly 50-50" to make his return to the field in Week 12, Head Coach Vic Fangio said Thursday.

Chubb "did fine" in practice on Wednesday, and Fangio said he hoped to see Chubb make "some more strides" on Thursday.

If Chubb is able to make his first appearance since Week 2, he likely would not be able to play a full set of snaps. Fangio said conditioning would play a factor in his availability.

"If he does play, it would be in limited numbers," Fangio said. "And he's got to feel confident on it."

Fangio said he was hopeful Chubb would be able to handle more than just a rotational role of 12-14 plays.

Chubb underwent an arthroscopic procedure on his ankle following the Broncos' Week 2 win over the Jaguars and has been on injured reserve since the surgery.

Starting right tackle Bobby Massie is also expected to be 50-50 for Sunday's game. He was a limited participant in Wednesday's practice after exiting the team's Week 9 game against Dallas with an ankle injury.

Safety Kareem Jackson (neck) was not expected to practice Thursday after missing Wednesday's session. If Jackson is unable to play on Sunday, Fangio said he has a "really high" level of confidence in rookie Caden Sterns to replace Jackson.

"Caden's done well for us and we think he'll go in and play good if he has to," Fangio said.

Starting left tackle Garett Bolles also remained away from practice, as he is still on the Reserve/COVID-19 list. Fangio said he must post two negative tests to return, and that has yet to happen.