West Ham have crippled Chelsea’s plans with a 3:2 Victory at the London stadium after coming from behind twice.
The Hammers have now defeated Chelsea, Liverpool and Manchester United this season already.
Chelsea top of table lead is now in big doubt as Mancity and Liverpool will look forward to winning their matches later today in order to go ahead of Thomas Tuchel men.
The blues started brightly, on the 28th minutes Thiago Silva nodded home Mason Mount corner kick into the net to give the blues and opener.
Not long after, Lanzini pulled the host on level terms from the spot kick after a careless handling of the ball on the foot by Edouard Mendy that gave a West Ham player to press higher.
Right before the struck of halftime, Mason Mount restored the lead for the visitors gifting the England international his fifth goal since Tuchel took over.
Bowen had a beautiful lowly shot down the side of the box that went past Mendy into the net.
Just like when it looked like the blues had settled for a draw, Masuaku pulled a cross in the box that went straight towards Mendy on goal.
Chelsea will have to pray Liverpool and Manchester City do not win later today in order to remain top of the English Premier league.
The blues are yet to record a win against West Ham away from home in seven Premier league games now.
West Ham still maintain fourth place with 27points through 15 games while Chelsea are still top with 33 points but could be displaced depending on result from Man City and Liverpool.
West Ham are the first team in three years to defeat Chelsea after loosing at halftime.