OWINGS MILLS - Outside linebacker Terrell Suggs, right guard Marshal Yanda and safety Bernard Pollard are among eight injured Ravens listed as questionable for Sunday's matchup with the Broncos.
Suggs (torn biceps) was a full participant in practice for the second straight day Friday and appears likely to play Sunday, but Yanda (sprained ankle) and Pollard (ribs) both look likely to miss the game.
Yanda and Pollard both missed practice for a third straight day Friday.
Yanda was still in a walking boot Friday afternoon.
If Yanda's unavailable, veteran Bobbie Williams will likely replace him in the starting lineup.
Williams has played in 11 games this season and made four starts at left guard. He stepped in for Yanda after Yanda was injured against the Redskins last week.
"If [Yanda's] not able to go, that's unfortunate, but we've got great guys," Baltimore center Matt Birk said. "Bobbie's played a lot of football and he can step in there and do a great job."
If Pollard doesn't play, James Ihedigbo would start at strong safety.
Ihedigbo has been mostly relegated to special teams this season, but started 12 games for the Patriots last year.
A tough, physical player, the 6-foot-1, 214-pound Ihedigbo had a crucial sack late in the Ravens' 13-10 win against the Steelers in Week 11.
"We're confident in James," Baltimore linebacker Josh Bynes said. "He does great on special teams and he's going to do very well on defense. He's been in some packages for us and he's been doing well. I think James is going to be an awesome fit. He's physical and strong on special teams, and he's going to do the same thing on defense."
NO UPDATE ON LEWIS: Harbaugh gave no update on middle linebacker Ray Lewis's availability for Sunday.
Lewis is eligible to be activated from the injured reserve - designated to return list this week, but it's unclear if he's ready for game action just two months after suffering a complete tear of his right triceps, an injury that typically involves a four to six month recovery.
ELLERBE QUESTIONABLE: Middle linebacker Dannell Ellerbe said he's improving from the ankle injury he sustained against the Chargers in Week 12, but voiced uncertainty regarding his status for Sunday.
He's listed as questionable.
"I'm going to work it before the game," Ellerbe said. "If I feel good, I'm going to go. And if I can't go, I'm not going to go out there and hurt the team."
Ellerbe has missed each of the last two games.
Prior to getting injured against San Diego, Ellerbe had recorded a team-high 45 tackles in the previous four games.
OTHER INJURIES: Cornerback Jimmy Smith (sports hernia surgery), fullback Vonta Leach (ankle) and defensive linemen Arthur Jones (shoulder) and Pernell McPhee (groin/thigh) are also listed as questionable for Sunday, but Smith, Leach and Jones all appear likely to play. McPhee's availability is more iffy.
Smith was a full participant in practice each of the last three days, Jones practiced on a limited basis Thursday and Friday and Leach and McPhee were both limited participants Friday after missing practice the previous two days.
Tight end Ed Dickson (sprained knee) is doubtful for Sunday. Like Ellerbe, he was injured against the Chargers and has been sidelined for the last two games.
FURTHER EXAMINATION ON McCLAIN: Harbaugh said Friday that middle linebacker Jameel McClain is in California getting further examination on his injured neck and back.
"We'll know more about that Monday or Tuesday," Harbaugh said.
McClain has been ruled out of Sunday's game against Denver since Wednesday. He was injured during the third quarter of last week's loss to the Redskins, lying on the field for several minutes before walking to the sideline under his own power.
X-rays on his neck were negative.
McClain's 79 tackles are third-most on the team.