Roberto Martinez has confirmed an injury to Arouna Kone meant the forward was unavailable for the 2-0 win at Aston Villa on Saturday.
The Blues emerged from the Midlands victorious thanks to second-half goals from Romelu Lukaku and Leon Osman, but Ivorian Kone was not named in the matchday squad.
After the game, Martinez explained his absence as being down to a knock sustained a week prior.
"It was during the last game against Hull City," said the Everton manager.
"He received the ball and then got a strong challenge on his knee.
"We're hoping that it's not going to be too much of a serious problem, but he's going to miss the best part of four days."
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