West Ham have sacked manager Manuel Pellegrini after a 2-1 home defeat by Leicester City in the Premier League on Saturday.
The Hammers have now lost their last four home matches in the Premier League, their worst run since January 2006, and have picked up just one point from a possible 18 at the London Stadium since their 2-0 win over Manchester United.
Demarai Gray missed a first-half penalty for Leicester, but the home side recovered from the early setback to take the lead through Kelechi Iheanacho's close-range header on 45 minutes.
West Ham levelled through Pablo Fornals' smart finish just before half-time, but Gray hit the winner on 56 minutes.
Leicester remain in second place, four points clear of Manchester City in third, while West Ham remain fourth from bottom, a point clear of the relegation zone.
Pellegrini leaves after 18 months in charge at the Olympic Stadium, having been appointed in May 2018 on a three-year deal.
"It is with great disappointment that we've had to make this decision," said joint-chairman David Sullivan.
"It has become clear that a change is required to get the club back on track in line with our ambitions this season.
"We felt it was necessary to act now in order to give the new manager as much time as possible to try and achieve that goal."
By Nick Royle
Photo: Getty Images