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Quarterback Matt Schaub will be unavailable Sunday when the Raiders suit up to play the Patriots in Foxboro, Ma.
Schaub left for Boston for personal reasons and will not be backing up quarterback Derek Carr Sunday.
Carr was anointed the starter prior to Week 1 of the regular season.
Carr will get his third career start Sunday against a fast, experienced Patriots defense that features Vince Wilfork, Chandler Jones and Darrelle Revis.
Third-stringer Matt McGloin will be his backup. It remains uncertain whether Schaub will travel with the Raiders to London for the Week 4 contest vs. Miami.