Tomas Soucek saw his goal for West Ham chalked off by VAR after a wait of more than three minutes.
Michail Antonio attempted an overhead kick from the corner and soon became involved in a goalmouth scramble with Chelsea captain Cesar Azpilicueta.
The ball then popped to Soucek who believed he had chipped the ball over the prostrate Antonio and past Kepa Arrizabalaga.
West Ham's Tomas Soucek saw his goal against Chelsea controversially ruled out by VAR
But after some West Ham celebrations, VAR took around three-and-a-half minutes to mull over Antonio's involvement in the goal.