Chelsea crashed to a shock 3-2 defeat at West Ham as Arthur Masuaku’s fortuitous late winner capped the Premier League leaders’ second half collapse in a dramatic London derby on Saturday.

Thomas Tuchel’s side went ahead through Thiago Silva but Manuel Lanzini’s penalty drew West Ham level. Mason Mount restored Chelsea’s advantage just before half-time, only for Jarrod Bowen to blast West Ham’s second equaliser soon after the interval.