David Moyes will leave West Ham at the end of the season with former Wolves boss Julen Lopetegui set to replace him.
Moyes leaves his role as manager at the London Stadium "by mutual consent" when his contract expires at the end of the current campaign.
The Hammers have the recruitment process for Moyes' successor had begun and they would make no further comment on the matter until the new appointment was confirmed.
However, it is understood West Ham's agreement with Lopetegui will see him take over as a head coach, as opposed to the role Moyes held as manager.
Moyes guided West Ham to their first European trophy since 1965 when they beat Fiorentina to lift the Europa Conference League last season.
This campaign, West Ham reached the Europa League quarter-finals and are currently ninth in the Premier League.
Moyes said: "I have enjoyed four and a half brilliant years at West Ham, and the club is in a stronger position than when I returned back in 2019. When I joined West Ham for a second time, the club was one place above the relegation zone, and it has been a terrific journey to have achieved three consecutive seasons in Europe.
"After leading the club to safety, we guided the team to finishes of sixth and seventh in the Premier League, and I was delighted when we won the Europa Conference League title last June - the club's first major trophy in 43 years.
"I would like to thank all the players for their support, and all the success they have achieved, over the last four and a half years. I have really enjoyed working with everyone at West Ham, and I would like to thank the Board for giving me the opportunity to manage this great club."
West Ham's joint-chairman David Sullivan said: "On behalf of everyone at West Ham United, I
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