"I'm not getting into percentages of that," Harbaugh said. "I really don't know."
Suggs practiced on a limited basis as well as tight end Ed Dickson, who missed the past two games with a hyperextended right knee, backup running back Bernard Pierce (back) and running back Ray Rice (hip contusion).
Yanda is expected to miss this game with a serious sprained right ankle. He's not on crutches, but remains in a walking boot.
"I'm getting healthy as fast as possible, that's the plan," Yanda said. "I'm going to treat it and get back as fast as possible."
Before he injured his ankle against the San Diego Chargers, Ellerbe was emerging as one of the Ravens' top defensive playmakers. He recorded 78 tackles and had 4 1/2 sacks as the best inside blitzer on the defense.
After missing two games, Ellerbe said there's a chance he returns for the pivotal home game Sunday. However, there's a better chance he'll return the following week against the New York Giants.
Ellerbe has been plagued by injuries, including a left foot problem that's not as serious as the ankle, a broken thumb and a sprained thumb.
"They need me out there making plays," Ellerbe said. "They don't need me out there gimpy. ... That's a terrible feeling, to see your guys out there fighting and trying to win the game. You can't help them, and you know you're an asset to the team, but you can't go out there and help. It's just something that is hard to deal with."
If Ellerbe misses his third straight game, then the Ravens will likely go with a combination of Bynes and McClellan.
Bynes played a career-high 44 snaps against the Redskins and recorded a career-high five tackles, but also missed some tackles in the open field.
"I always prepare like I'm going to play, and I'm definitely going to play," Bynes said. "I'll go out there and do what I have to do to win this game."
Pollard has started every game this season, but is constantly bothered by a rib injury sustained in the second game against the Philadelphia Eagles.
If Pollard is out, then James Ihedigbo would start at strong safety opposite Ed Reed, facing Broncos star quarterback Peyton Manning and a talented receiving corps headlined by Demaryius Thomas and Eric Decker.
"It's just that time of year," Ihedigbo said. "All hands are going to be on deck. Whatever is needed by me, I'm ready to do. Bernard is a fighter just like the rest of the guys.
"Who across the league isn't playing with pain? Injuries are a part of the game. It's a league where guys play hurt if necessary."