Bears defensive tackle Tommie Harris is expected to be sidelined for Sunday's gameagainst the Bengals with a knee injury after missing his third consecutive practice Friday.
His left knee has given him problems since the 2007 season, when he first injured it against the Cowboys.
Marcus Harrison has gotten first-team reps at defensive tackle with Harris sidelined and should step in next to nose tackle Anthony Adams.
UPDATE- 3:11pm ET: Harris will be officially listed as Doubtful for the game Sunday, meaning there is a 25% or less chance that he will play. Said Lovie Smith:
"Tommie still has some (knee) soreness from the last game," Smith said. "I can't spend a lot of time concerned about guys that can't (play) right now. I just want them to continue to get treatment and get better. That's what Tommie is doing."