The goalkeeper has been ruled out of tomorrow's game with a thigh problem after being kicked in Wednesday night's home defeat to Manchester City.
Karl Darlow is on standby to play in goal against Chris Hughton's side.
"Elliot is not available," said United manager Benitez. "He had a kick in his thigh and he felt it a little bit. He's rested."
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Benitez will also be without Aleksandar Mitrovic (back), Florian Lejeune (foot) and Jesus Gamez (ankle).
However, Isaac Hayden is set to return to his squad.