The Raiders placed LB Ricky Brown on injured reserve Saturday as a result of a concussion he suffered Sept. 25 against the Jets. He sat out last week's game vs. New England.
To fill his roster spot, Oakland promoted first-year FB Manase Tonga from its practice squad.
The Raiders are thin at fullback going into their game at Houston on Sunday. Starter Marcel Reece is questionable with an ankle injury, and his backup, Richard Gordon, is out with a broken hand.