SAN DIEGO - - Nose tackle Jamal Williams was placed on injured reserve Saturday, which means the San Diego Chargers will be without two starting defensive linemen against the Ravens.
Williams suffered an elbow injury during Monday night's victory over the Oakland Raiders and had been listed as questionable on the team's injury report.
The move ends Williams' season.
He will join defensive end Travis Johnson (groin) on the sideline, leaving San Diego with only one defensive tackle (Ogemdi Nwagbuo).
The Chargers promoted defensive end Andre Coleman from the practice squad to fill Williams' roster spot.
A 6-foot-3, 350-pound lineman, Williams has been a key piece to the Chargers' run defense.
He was drafted in the second round of the 1998 supplemental draft and has been named to the Pro Bowl three times (2005, 2006 and 2007).