There was little sign of what was to come during a largely uneventful first half, where neither team really threatened the opposition goalkeeper, despite Chelsea enjoying the vast majority of possession against a West Ham side who were happy to sit back and defend.

However, midway through the second session, the visitors somehow took the lead completely against the run of play. Edouard Mendy managed to claw a dangerous corner away from his goal but was floored by a bundle of bodies in the process, meaning when the ball came back in there was nothing he could do to prevent Michail Antonio from scrambling in at close range.

Chelsea tried to increase the pressure but it took a double substitution to find a way back into the game, as Ben Chilwell did brilliantly to latch on to Thiago Silva's high pass into the box, beating two defenders in the air before directing the dropping ball under Lukasz Fabianski and into the net.

Chilwell then turned provider to put the Blues ahead with two minutes remaining, as his low cross was turned in by fellow sub Kai Havertz, but that turned out to be far from the end of the drama.