Alvaro Morata had a mini-tantrum after being hauled off in the closing stages of Chelsea's 2-1 win over Burnley on Thursday night.
A second-half winner from Victor Moses secured three points for the visitors after Ashley Barnes' fortuitous deflection had cancelled out Kevin Long's own goal.
But Morata again endured a difficult evening in front of goal, missing good chances either side of half-time as his disappointing first season in England continued.
The striker was denied by a smart save by Nick Pope in the first-half before wasting a glorious chance to double Chelsea's lead, sliding a shot wide when through on goal.