Posted by ESPN.com's Kevin Seifert
ATLANTA -- Chicago will have to play without two more defensive backs as Atlanta quarterback Matt Ryan continues to plow through their pass defense.
Cornerback Charles Tillman (shoulder) and safety Danieal Manning (hamstring) are out for the rest of the game. Trumaine McBride was also shaken up in the first half. That leaves the Bears with little-used Marcus Hamilton playing alongside cornerback Corey Graham.
At this point, it doesn't look like the Bears are using a nickel defense.