According to the Green Bay Packers Official Blog, Packers LBs Clay Matthews and Nick Perry, who have missed the team's last 4 and 3 games respectively, returned to practice yesterday on a limited basis. Matthews is currently recovering from a broken thumb he suffered Week 5, while Perry is coming back from a foot injury he suffered Week 6.
In my opinion, these two guys playing on Sunday is needed for the team to win. Against the Bears, the Pack's defense was absolutely terrible, so having these two back definitely would help. It wouldn't necessarily be a quick fix to all of their defensive problems, but it wouldn't hurt.