Ngata, a six-foot four, 340-pound cog in the middle of the Ravens' 3-4 defense, has been listed as inactive. He sprained his knee in Baltimore's 20-17 overtime win over the Bengals last week and was listed as questionable heading into the weekend. It's a significant loss for a defense that will face Matt Forte and a Bears offense that ranks seventh in the league with 4.5 yards per carry on the ground. With strong winds in the forecast at Soldier Field, the game will rely even more on the ground game.
Chicago will be without their own nose tackle, as Jay Ratliff has been listed as inactive. Among the other notable holdouts for the Bears are quarterback Jay Cutler and linebacker Lance Briggs. Offensive tackles James Brown and Jonathan Scott, defensive end Shea McClellin and long snapper Patrick Mannelly have also been listed as inactive.