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Allen sustained a concussion during the Raiders' regular season finale Sunday against the Broncos, Jimmy Durkin of The Mercury News reports.
Allen (quadriceps) is questionable to play against the Chiefs this weekend, Vic Tafur of the San Francisco Chronicle reports.
Allen is listed as the Raiders starting strong safety in the depth chart released on Tuesday.
Allen will likely get the start at safety during Saturday's preseason game against the Titans, Scott Bair of CSN Bay Area reports.