Chelsea will find out on Monday the extent of John Terry's ankle injury after the Blues drew 2-2 at Swansea.
Diego Costa had fired the Blues into a first half lead but the Belgian goalkeeper stupidly hurled himself at Gylfi Sigurdsson in the penalty area to concede a spot kick that the Iceland international dispatched with aplomb.
And, just moments later, Gary Cahill was caught in possession by Leroy Fer who raced in to slot the ball past Courtois.
Costa, who was his usual warrior self, equalised with an overhead kick that went in off the face of Stephen Kingsley.
But, in the final moments, Terry was seen hobbling and went to the ground after the final whistle with an ankle injury.
And manager Antonio Conte is unsure how bad it is but, given the state of the Chelsea captain as he left the Liberty Stadium, he is likely to be a doubt for Friday's game with Liverpool.
He said: “I don't know the extent of John's injury. We'll find out tomorrow about his ankle. He is a warrior so I'm not worried.”