The France international forward has been sidelined with a hamstring injury since early in December
Ousmane Dembele has returned to training with Barcelona and could feature against Eibar at the end of the month.
France international Dembele has had a string of injury problems, with a hamstring complaint sidelining him since the game with Cadiz on December 5.
He returned to training on Sunday, but the Liga game with Valladolid on Tuesday will come too soon for the forward.
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“He did part of the training session with the reserves yesterday, which is normal the day after the game,” Koeman said at a press conference on Monday.