Mustafi thought he had given Arsenal a deserved lead when he headed in from a free-kick after 76 minutes.
The excitement, however, was short lived as referee Michael Oliver correctly disallowed the goal for offside.
The German defender wheeled away celebrating, as did an overly eager Arsenal fan. The man attempted to join Mustafi but was quickly escorted away by stewards.
An #Arsenal fan was kicked out of Stamford Bridge for running onto the pitch after #Mustafi's offside goal. pic.twitter.com/orBzZSmySq
— Arsenal Related (@ArsenalsRelated) 17 de setembro de 2017
The game ended in a draw, a positive result for Arsene Wenger's men given that they have lost the five previous meetings at Stamford Bridge, but one supporter may be left feeling slightly humiliated...