"The first half of the 2024/25 season has not aligned with the club's ambitions and the club has therefore taken action in line with its objectives," West Ham said in a statement.

The statement added: "The board would like to thank Julen and his staff for their hard work during their time with the Hammers and wish them every success for the future."

West Ham were among the biggest spenders in the Premier League in the summer transfer window, splashing out around £125 million ($155 million) on players including Max Kilman, Crysencio Summerville and Niclas Fullkrug.

But Lopetegui won just one of his first six league games and oversaw several heavy defeats, including a 5-2 loss to Arsenal and a 5-0 drubbing by Liverpool, both at home.

The 58-year-old former Real Madrid and Spain boss was appointed in May last year to replace David Moyes, who left at the end of last season after a second spell at the London club.

Under the Scot, West Ham qualified for European competition for three consecutive seasons, winning the Europa Conference League in 2023 to secure the club's first major trophy in 43 years.

Lopetegui, who had previously managed Wolves in the Premier League, said at the time of his appointment he had other opportunities but he was "very happy that West Ham chose me because I chose West Ham too".

In their search for a replacement for Lopetegui, the club reportedly spoke to former AC Milan boss Paulo Fonseca and ex-Paris St-Germain manager Christophe Galtier.

Potter, 49, has been out of management since he was sacked by Chelsea in April 2023, just seven months into a five-year contract. He won a mere 12 of his 31 matches in charge.

The Englishman began his managerial career at Swedish club Ostersund and had successful spells with Swansea and Brighton before taking over at Stamford Bridge.

West Ham face Aston Villa in the FA Cup third round on Friday.

Lopetegui is the fifth Premier League manager to lose his job this season, following the sackings of Erik ten Hag, Steve Cooper, Gary O'Neil and Russell Martin.

AFP

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Graham Potter named West Ham boss after Lopetegui's sacking

West Ham sack manager Julen Lopetegui with Graham Potter expected to take over