LONDON (AFP) - Chelsea manager Jose Mourinho was sent to the stands as the Premier League champions' crisis deepened with a stormy 2-1 defeat at West Ham United on Saturday.
He was banished from the touchline by referee Jon Moss at half-time at Upton Park after seeing Mauro Zarate put West Ham ahead before Chelsea midfielder Nemanja Matic was sent off for two bookable offences.
Mourinho's assistant Silvino Louro was also sent off for protesting against Matic's dismissal and although Gary Cahill equalised early in the second half, West Ham substitute Andy Carroll headed in a 79th-minute winner.
It was Chelsea's fifth defeat of a wretched season and left them in 15th place in the table, 10 points below leaders Manchester City ahead of Sunday's Manchester derby at Old Trafford.
Slaven Bilic's West Ham, now unbeaten in seven league games, climbed to second, although they will be leapfrogged if third-place Arsenal beat Everton later on Saturday.
Mourinho now risks a stadium ban, having been handed a suspended one-game ban by the Football Association last week for accusing the referee of being "afraid" during his side's recent 3-1 home defeat by Southampton.
Chelsea were unchanged from the mid-week 0-0 draw at Dynamo Kiev in the Champions League, with Cahill, Matic and Eden Hazard named in the team after starting last weekend's 2-0 win over Aston Villa on the bench.
West Ham went ahead in the 17th minute when Diego Costa miscued an attempted clearance at a corner and Zarate bludgeoned a low shot into the bottom-right corner.
It prompted chants of "You're getting sacked in the morning!" towards Mourinho from West Ham's fans and the Chelsea manager's mood will have darkened further when Kurt Zouma had a header cleared off the line by Manuel Lanzini.
The Hawk-eye replay revealed the ball had failed to fully cross the line by a matter of millimetres.
After Lanzini shot over from Dimitri Payet's exquisite flick and Cesc Fabregas had seen a goal ruled out for offside, Matic was shown a second yellow card for blocking off Diafra Sakho wide on the Chelsea left.
It drew a wry smile from Mourinho, who took a seat in the directors' box at the start of the second half.
Cahill slammed home from a corner 11 minutes into the second half, only for Carroll to rise from the bench and meet Aaron Cresswell's left-wing cross with a trademark header for his first goal of the season.
Elsewhere, Jamie Vardy became the eighth player to score in seven successive Premier League games as Leicester City beat Crystal Palace 1-0 to move up to fifth place, four points clear of sixth-place Palace.
Meanwhile, Andre Ayew increased the pressure on beleaguered Aston Villa manager Tim Sherwood with an 87th-minute goal that gave Swansea City a 2-1 win at Villa Park.
Ayew's younger brother Jordan had headed Villa ahead in the 62nd minute, but Gylfi Sigurdsson equalised six minutes later with a fine 25-metre free kick before Ayew the elder struck at the death.
Defeat left Villa second from bottom, four points from safety, with only four points from 10 games.
Watford captain Troy Deeney scored his first Premier League goal and Almen Abdi also found the net as the promoted side ended Stoke City's three-game winning streak with a 2-0 win at the Britannia Stadium.
Meanwhile, Salomon Rondon's header earned West Bromwich Albion a 1-0 victory at Norwich City.