ENGLEWOOD, Colo. -- **Five days after suffering a concussion on a collision with Miami tight end Dion Sims, linebacker Brandon Marshall was cleared for physical activity through the NFL's post-concussion protocol and had a full practice of work Friday.
"I felt great," he said.
The third-year weakside linebacker received clearance after Thursday's practice, in which he was on the field, but took part in nothing beyond conditioning work. Marshall is listed as probable, for Sunday, providing a boost to a defense that faced the possibility of trying to contain Kansas City running backs Jamaal Charles and Knile Davis without its leading tackler.
"We'll take every healthy guy we can," said Defensive Coordinator Jack Del Rio. "Brandon has stepped in for Danny (Trevathan) and done a nice job for us. We're preparing the other guys in case we have another pop up right in the middle of the game.
"So you continue to work your backup guys, but him getting cleared is a good sign for us."
Marshall said he expects to have a normal workload Sunday, with no limitations.
Throughout the week, Marshall was confident that the examinations would clear him to play. He said that he was dizzy for "about two or three minutes" after the collision with Sims, but after that, felt good enough to want to go back onto the sideline to watch the final moments of the 39-36 win over Miami. However, medical personnel and the post-concussion protocol prevented him from doing so.
"It (the concussion) wasn't that bad, honestly," Marshall said. "Right after the game, I was good. I could drive, and I was good to go. It's just staying with the protocol. So I knew I would come back; it was just that i had to go through this whole thing.
"I didn't have any memory loss; I remember everything. I didn't have any headaches. So everything was good."
Look through photos of the Broncos' final practice before Sunday night's game, where Aqib Talib was back on the field.
But he was amazed at how Sims shook off the collision.
"It didn't look like it fazed him at all," Marshall said. "I tried to hit him, and he just shrugged it off. I'm, like, 'Damn.' I knew he was big, but I didn't know he was that solid like that."
While Marshall looks like he will be good to go Sunday night, the status of cornerback Aqib Talib, tight end Julius Thomas and safety Quinton Carter will be determined. All three were listed as questionable.
Carter practiced all week, but his work was limited because of a knee injury. Thomas returned to practice Thursday and saw limited work each of the last two days.
Talib did not practice until seeing limited work Friday. He worked out with the team's strength and conditioning coaches during the Thanksgiving practice a day earlier.
Cornerback Kayvon Webster and running backs Ronnie Hillman and Montee Ball were ruled out with their injuries. None of them practiced this week.
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