Gayle was forced off against Bournemouth last weekend with a "tight" hamstring after scoring two goals.
However, the striker has made a successful return to training and is available for tomorrow evening's game at Anfield.
"Dwight's fine and (Matt) Ritchie's fine," said Benitez. "They had little problems but they're OK."
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Benitez will be without midfielder Jonjo Shelvey, who suffered a knee injury in the 2-2 draw at the Vitality Stadium.
"Jonjo has a knock with his knee," said Benitez, who will also be without on-loan striker Islam Slimani (thigh).
"We're waiting for results of the scanes. At the moment we don't know how serious it is."