Everton midfielder Jean-Philippe Gbamin will probably be out for about three months after marathon operation.
After suffering a setback in his recovery from 18, the 24-year-old needed the operation in France.
Gbamin will now continue his rehab there with the medical staff of the club and had returned before this month.
The summer has made just two appearances for Everton so far this year – from Crystal Palace and Watford in August.
Everton are 18th at the table having won just two of the eight Premier League games this season.
West Ham is hosted by them that Saturday prior to a Visit to Brighton.
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