The club have also parted company with Lopetegui’s backroom staff, including his assistant Pablo Sanz, head of performance Oscar Caro, head analyst Juan Vicente Peinado, fitness coach Borja De Alba and technical coach Edu Rubio.

“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,” the club’s statement added.

“The process of appointing a replacement is under way.”

Former AC Milan boss Paulo Fonseca and ex-Paris St-Germain manager Christophe Galtier, currently in charge of Saudi Pro-League club Al Duhail, have also been spoken to by West Ham.

However the belief from both camps is that Potter will get the job.

West Ham’s next game is an FA Cup third-round tie at Aston Villa on Friday.

The Hammers’ 5-2 thrashing by Arsenal on 30 November and defeat by fellow strugglers Leicester City three days later put Lopetegui under pressure.

They went unbeaten in their next four games, including wins over Wolves and Southampton, before a 5-0 home defeat by league leaders Liverpool and Saturday’s loss at Manchester City.

It emerged earlier this week that the Hammers were considering sacking Lopetegui and had held talks with Potter about replacing him.

A news conference to preview Friday’s FA Cup tie against Aston Villa was cancelled on Wednesday morning, before Lopetegui’s dismissal was announced.

West Ham reached the Europa League quarter-finals and finished ninth in the Premier League during Moyes’ final season at the club.

They had won the Europa Conference League – their first trophy in 23 years – the previous season.

Former Spain and Real Madrid boss Lopetegui spent in the region of £125m over the summer to enhance his squad, but had an underwhelming start to the season.

As well as indifferent league form, the Hammers were beaten 5-1 by Liverpool in the third round of the Carabao Cup.