Chelsea suffered a shock 1-0 defeat to struggling West Ham United at Stamford Bridge on Saturday.
Aaron Cresswell scored the winner in the second half to condemn Chelsea to back-to-back Premier League defeats.
Chelsea remain in fourth place but Tottenham reduced the gap to seven points with a win over Bournemouth.
West Ham thought they had doubled their lead after 67 minutes through Michail Antonio but VAR disallowed the goal for handball.
The victory sees West Ham steer four points clear of the relegation places and eases the pressure off manager Manuel Pellegrini.