ENGLEWOOD, Colo. -- **Weakside linebacker Brandon Marshall saw limited work for a third consecutive day and is listed as questionable for Sunday's game against the Indianapolis Colts.
"In my mind, I know I could go. I know I could play," he said. "It just depends on what the coaches want to do, what the training staff wants to do. In my mind I can go, so we'll see what happens."
But the Broncos' leading tackler expressed optimism about the condition of his sprained right foot after taking part in each of the four practices this week.
"Today, I felt the best," Marshall said after Friday's practice. "I was able to get out there and really sprint like I haven't sprinted in three weeks. So I feel good. We'll see what happens as far as the lineup."
Marshall noted that Friday's work was significant because it was the first time since he suffered the injury Dec. 14 at San Diego that he awoke not worrying about how the foot would respond.
"Oh, yeah. I got past it," he said. "I think today was the day that I really woke up and it felt better. I was more confident going out to practice, and when I was running, it felt great."
But if the foot injury hinders Marshall on Sunday, rookie Todd Davis is prepared to spell him. Davis started in Weeks 16 and 17, and teammates and coaches alike spoke in glowing terms about his progress from his first NFL start to his second.
"I just think I felt more comfortable," Davis said. "I had a better understanding of the defense. I watched a lot more film going into the [Raiders game].
"I just think that my teammates definitely helped me feel more comfortable. I think that was the biggest thing in the second game -- my comfort level."
Watching in sweats the last two games, Marshall helped Davis adjust.
"The whole time, he was like an extra coach out there, doing everything he could to get me right, get the other linebackers right," Davis said. "I really appreciate what he did while he was off. He helped tremendously."
Watching film of Marshall also helped Davis adapt, since he saw an example of how to play weakside linebacker at an elite level in the Broncos' scheme.
"He's a great player, so watching him on film, I definitely get a lot of points, a lot of keys and experience by not being out there, just by seeing how he plays it and how he works it," Davis said. "It definitely helps a lot, because he did such a great job."
Davis took particular note of Marshall's adaptability.
"There's things that we might go over in a practice, and then we get in a game, and it's totally different, and he's able to adapt and call the defense and put guys where they need to be, and also handle his job," Davis said. "I think that's the biggest quality I see in him."
While Friday's news was good for Marshall, the same could not be said of defensive end Quanterus Smith, who was ruled out for Sunday with a knee injury. His absence Friday ended the Broncos' modest streak of days with 100 percent practice participation at two.
Smith is being evaluated after suffering an injury to his left knee -- the same one in which he tore his anterior cruciate ligament in November 2012 while playing for Western Kentucky.
Defensive tackle Mitch Unrein was the only other Bronco who was limited in Friday's practice. Like Marshall, he is questionable. All other Broncos on the official injury report are listed as probable for Sunday and had full workloads Friday, including quarterback Peyton Manning and safety T.J. Ward.
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Jacob Tamme led the breakdown as the Broncos' preparation for Sunday's game continued.