The Indianapolis Colts will be missing three defensive starters Sunday against Oakland.
Session hasn't played since Nov. 1 because of a broken right forearm and dislocated right elbow. Hayden will miss his third straight game with a neck injury. Muir is sitting out with a chest injury, meaning the Colts will be without their best run-stuffer against Darren McFadden and Michael Bush.
The good news is two-time 1,000-yard runner Joseph Addai made the trip and is likely to play for the first time since hurting a nerve in his left shoulder Oct. 17.