Sanborn is being evaluated for a concussion and is questionable to return to Sunday's game against the Jets, Calvin Watkins of The Dallas Morning News reports.
Sanborn was taken back to the locker room after taking a hit to the head, where he will undergo further tests for a concussion. Shemar James and Marist Liufau are in line to see more snaps at linebacker for as long as Sanborn is out of the game.