Frank Lampard insisted Chelsea have a lot of hard work ahead to reach the level of Premier League champions Liverpool and Manchester City following their shock loss at lowly West Ham.
Chelsea suffered a surprise 3-2 defeat to West Ham, who moved three points clear of the relegation zone thanks to Andriy Yarmolenko's 89th-minute winner at the London Stadium.
Willian's brace was not enough for Chelsea to secure at least a point away from home – the result ending the club's six-game unbeaten streak in all competitions.
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Chelsea remain fourth in the table, just two points clear of in-form Manchester United and Wolves with six matches remaining in the race for Champions League qualification.