ENGLEWOOD, Colo. — Quarterback Drew Lock is questionable to play in Sunday's game against the Dolphins after being limited in practice on both Thursday and Friday.

Lock suffered an injury to his ribs against the Raiders in Week 10 and did not practice on Wednesday.

Head Coach Vic Fangio said before Friday's practice he hopes to make a decision by the end of the day on Saturday about whether Lock or Brett Rypien will start at quarterback. Both players were expected to receive reps on Friday.

"Throwing and operating without showing any effects of the injury and then also when he comes in the following day, how he feels," said Fangio when asked what he needs to see from Lock. "To me, that's the big thing. Is he throwing it accurately, is he throwing it on time, is his motion altered at all — anything like that."

Fangio said Lock was "a little sore" on Friday morning after practice Thursday but that was "to be expected."

"He hadn't really done much since the game on Sunday," Fangio said. "But [I] didn't see too much of the altering of his delivery and stuff."

Fangio said if Lock is not healthy enough to start, he could potentially serve as the team's emergency backup and be active on game day.

"I think all options are on the table as it relates to that moving forward," Fangio said. "He could be the backup if we decide not to start him, or he could be inactive — either way."

If Lock does play, Fangio believes he is positioned to improve from a four-interception performance against the Raiders.

"I think so," Fangio said. "The reps he took yesterday, he had a good day mentally for the most part. I think he's in a good spot."

If Lock does play, it's uncertain whether he'll have one of his top weapons, as tight end Noah Fant was also listed as questionable with an injury to his ribs. Fant was a full participant on Friday. Tackle Jake Rodgers (shoulder), cornerback Bryce Callahan (illness), guard Graham Glasgow (calf) and defensive lineman DeShawn Williams (ankle) are also listed as questionable. Callahan did not practice Friday and Glasgow and Williams were limited as they were added to the injury report.

Linebacker Joe Jones (calf) was ruled out for the second consecutive game.

Fangio also said he did not believe fullback/tight end Andrew Beck or tackle Elijah Wilkinson would be activated from injured reserve ahead of Sunday's game.