West Ham have sacked their head coach, Graham Potter, after a poor run of results for the club, reports Sky Sports.
Potter was only appointed in January to replace Julen Lopetegui as head coach on a two-and-a-half-year contract.
In a statement, the club said: "West Ham United can confirm that Head Coach Graham Potter has left the Club. Results and performances over the course of the second half of last season and the start of the 2025/26 season have not matched expectations, and the Board of Directors believe that a change is necessary in order to help improve the team's position in the Premier League as soon as possible."
West Ham said the process of appointing a replacement was "under way".
The sacking comes as the side prepares to face former manager David Moyes' Everton away on Monday night.
The Hammers' tough start to the 2025/26 campaign has seen them pick up just three points in their opening five games, with their four losses and sole win against Nottingham Forest leaving the side 19th in the league, above only winless Wolves.
Potter was sacked after winning just six of 23 Premier League games, with his side finishing 14th last season.
His assistant coach, Bruno Saltor, first team coaches Billy Reid and Narcis Pelach, and goalkeeper coaches Casper Ankergren and Linus Kandolin have also left the club.
The club thanked Potter and his outgoing staff in its statement, adding the board "wish them every success for the future".
Potter got the West Ham job off the back of a similarly brief spell at London rivals Chelsea, which saw him in charge for just 31 games between September 2022 and April 2023.