Casillas (neck/wrist) has been ruled out for Sunday's game against the Raiders, Ralph Vacchiano of SportsNet New York reports.
Casillas was able to play through a neck stinger over the past three games, but he may have suffered a setback in the Thanksgiving Day loss to the Redskins, as he was unable to practice in any capacity this week. The veteran linebacker has 35 tackles (25 solo) through eight games.