Williams missed the first nine games of the season while serving two NFL-mandated suspensions that cost him about $4 million. He's expected to play in sub packages and maybe special teams.
Dumervil left last week's win at Carolina with a sprained left shoulder, but returned to practice Friday and said he felt good enough to play in the game. The Broncos might limit his snaps, however.
Denver has two starting lineup changes Sunday: Manny Ramirez starts at right guard for Chris Kuper (ankle) and Chris Harris starts at right cornerback for Tracy Porter.
Chargers tight end Dante Rosario (hamstring) was deactivated in his return to Denver, where he played last season, and Mike Harris started at left tackle for Jared Gaither (groin).