Manager David Moyes has left West Ham after just over six months in charge.
The 55-year-old took over from Slaven Bilic on a short-term contract in November with the club in the Premier League relegation zone.
Moyes recorded nine wins and 10 draws from 31 games as West Ham secured safety with two games to spare and finished 13th.
"When David and his team arrived, it was the wish of both parties that the focus be only on the six months until the end of the season, at which point a decision would be made with regards to the future," said West Ham joint-chairman David Sullivan.
"We feel that it is right to move in a different direction. We aim to appoint a high-calibre figure who we feel will lead the club into an exciting future for our loyal supporters within the next 10 days."
Moyes' assistants Alan Irvine, Stuart Pearce and Billy McKinlay have also left with immediate effect.