Looks like Derrick Brooks won't be in the mix afterall.  From Brad Biggs:

In another sign that the Bears believe they will be healed up soon at linebacker, the club has made a roster move at the position with an eye toward special teams and not the defense.

That means Derrick Brooks is not coming to town. Instead, veteran linebacker Darrell McClover has been brought in for the second time in just more than a month, according to a source close to the player. McClover was signed by the team and takes the place of DeAngelo Smith, who was claimed off waivers from the Cleveland Browns two weeks ago. The Chicago Tribune first reported Smith would be cut. McClover can help on special teams immediately, an area that has been thinned out because of the injuries at linebacker. The Bears signed Tim Shaw was as a young guy who could come in and help out on special teams after Brian Urlacher was lost for the season. McClover can also do that and he's probably more familiar with the defense than Shaw.