Diego Costa could possibly face retrospective action from the FA after he appeared to bite Everton's Gareth Barry; just minutes after footage looked to show him spitting in the direction of referee Michael Oliver.
The Chelsea forward was at the centre of a number of controversial incidents during a physical encounter at Goodison Park.
Two goals from former Chelsea frontman Romelu Lukaku dumped the Blues out of their second cup competition in four days, and the actions of Diego Costa threaten to compound Guus Hiddink's woes.
The Spaniard was denied what appeared to be a clear penalty halfway through the first period and the frustration was clearly getting to the 27-year-old.
After a series of clashes with Everton's Gareth Barry, referee Michael Oliver cautioned the striker without booking Barry.
The Spaniard was denied what appeared to be a clear penalty halfway through the first period and the frustration was clearly getting to the 27-year-old.
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| Diego Costa clashes with Gareth Barry |
The game threatened to over boil as Costa remonstrated with the referee.
In footage which has since been shared multiple times on Twitter, the controversial striker appears to react to the decision by spitting in the direction of the referee.
Michael Oliver did not react to the incident, but a number of viewers took to Twitter to voice their suspicions.
The footage is far from conclusive, and Oliver did not respond to Costa's bizarre action.
However the 27-year-old again clashed with Barry after the visitors had fallen behind to two goals from former Blue, Romelu Lukaku.
The pair clashed heads before footage appeared to show Costa biting the former England midfielder.
After another brief fracas, the duelling players were separated and Costa was duly given his marching orders.
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| Diego Costa clashes with Gareth Barry |
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