Everton midfielder Jean-Philippe Gbamin will probably be out for three months after marathon operation.
The 24-year-old needed the surgery in France on Tuesday after suffering a setback in his recovery from trauma.
Gbamin had returned this month and will now continue his rehab there with the medical team of all the club.
The summer has made only two appearances from Watford and Crystal Palace so much this year – for Everton in August.
Everton are 18th at the table having won only two of the eight Premier League matches this season.
West Ham is hosted by them this Saturday to Brighton.
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