ENGLEWOOD, Colo. --Defensive linemen Mitch Unrein and Quanterus Smith joined weakside linebacker Brandon Marshall as players who practiced on a limited basis during Thursday's practice.

The Broncos added Unrein and Smith to the injury report because of knee injuries. Beyond those three defenders, everyone else on the roster had full participation, including quarterback Peyton Manning and tight end Julius Thomas.

Although Thomas has just three receptions for 63 yards since returning to game repetitions from the ankle injury he suffered in Week 11 at St. Louis, Head Coach John Fox said that the fourth-year tight end is where he needs to be physically.

"No more or less than anybody else we'll have active on Sunday," Fox said. "You reach this point in the season -- whether it's late regular season or early playoff season -- and guys are playing with different [injuries]."

One who could play through an injury is Marshall, who practiced for the third time in as many opportunities this week after missing three weeks of practice because of a sprained right foot.

Defensive Coordinator Jack Del Rio said Marshall was moving "pretty good" around the field this week.

"From what I've seen, he looks good to me," added cornerback Chris Harris Jr. "I haven't really specifically asked him how he feels … but the little time I've seen him, he's looked good to me."

The impact of Marshall's potential return could be profound.

"It would be pretty big being able to get him back," defensive end DeMarcus Ware said. "But we've got Todd [Davis] and we've got T.J. [Ward] back, we've got those guys, and the other linebackers.

"You've got to play with what you have, and being able to have Brandon Marshall back is big. He's that linebacker that's calling plays, making big plays, and he's that big playmaker that we need."

Added Harris: "We definitely need him."

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Emergency Room Care/ Denver ERs

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