West Ham sacked manager Slaven Bilic on Monday after a poor run of results that have left the club in the Premier League relegation zone.
“West Ham United can confirm that Slaven Bilic has today left his position with the club,” the Hammers said in a statement on their website.
The 49-year-old was relieved of his duties at the club two days after the Hammers lost to Premier League rivals Liverpool at The London Stadium.
After a damaging 4-1 defeat, Bilic admitted he was in a “difficult situation”.
The club said the decision to sack the Croatian was necessary to move on in line with its resolve to achieve success.
They said: “The Chairmen and board of West Ham United would like to place on record their thanks and gratitude to Slaven and his team for their services over the past two-and-a-half years, but believe a change is now necessary in order for the club to move forward positively and in line with their ambition.
“West Ham United can confirm that Bilic’s coaching assistants Nikola Jurcevic, Edin Terzic, Julian Dicks and Miljenko Rak have also left the Club with immediate effect.
“The Club’s search for a new manager to take West Ham United forward is underway and an announcement regarding Bilic’s successor is expected to be made over the coming days.”