ENGLEWOOD, Colo. — As the Broncos began to prepare for the Chargers, they were without five key contributors at Wednesday's practice.

Wide receiver Tim Patrick (hamstring), running back Phillip Lindsay (concussion), defensive end Shelby Harris (illness), wide receiver/return specialist Diontae Spencer (shoulder) and tackle Demar Dotson (not injury related) did not practice on Wednesday.

Patrick and Spencer worked on a side field with trainers, while Lindsay briefly stretched on the side field near the end of the media-viewing portion of practice.

"Lindsay is in the concussion protocol, so that's a standardized step process that he has to go through," Head Coach Vic Fangio said. "We won't know until Friday at the earliest but probably not until Saturday if he can go or not."

Harris was not present, though Fangio said his illness was not COVID related and he expected the defensive lineman to be back at practice on Thursday.

Outside linebacker Jeremiah Attaochu (quad) and tight ends Andrew Beck (hamstring) and Jake Butt (hamstring) returned to practice Wednesday after missing Sunday's game against the Chiefs.

"I think a couple of them did well," Fangio said. "We'll see how they progress and come in tomorrow."

Attaochu has not played since Week 3.

Tight end Noah Fant was also limited with an ankle injury.

"Doing well," Fant said Tuesday when asked about his ankle. "A little sore as expected but getting through it. I feel like that's part of a football season."

Linebacker Austin Calitro, meanwhile, officially practiced Wednesday for the first time since suffering a hamstring injury in Week 3 and being placed on injured reserve. The Broncos designated him to return, which officially starts a 21-day window in which he can be activated to the 53-man roster. He is not given an official injury status, as he remains on IR.