The video evidence is inconclusive, so the only two people that know if Diego Costa did really bite Gareth Barry are the players themselves.
The clip appears to show the striker open his mouth on Barry’s neck, but whether to actually bit is another question.
Unsurprisingly, Diego Costa has denied the claims with a cub spokesman saying: “Diego spoke to club officials after the game and expressed regret over his reaction to the challenge from Gareth Barry that led to his red card, but Diego was also very clear that he did not bite him at any point during that altercation.”
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The Everton midfielder didn’t react as if he had been bitten and his manager, Roberto Martinez, claims that Barry played down the incident after the match.
"Gareth Barry said 'It's nothing to be worried about, I'm just disappointed to get a second yellow card',” Martinez told reporters, as per The Mirror.
"It is a game full of emotions and there were two sending-offs, the referee played a very good game.”
It's an honest statement from Barry considering Costa's fate probably relied on his version of events.
Watch the incident here:
The incident compounded a miserable day for the Blues as their season was effectively ended with the 2-0 loss.
It means that Guus Hiddink’s men have exited two competitions in the space of five days, after their Champions League defeat to Paris Saint-Germain on Wednesday.
If Costa is found guilty of biting Barry then the 27-year-old can expect a lengthy ban.
Barcelona striker Luis Suarez was banned for seven matches when he bit Otman Bakkal whilst playing for Ajax, a 10-match ban when he bit Branislav Ivanovic whilst playing for Liverpool and a four-month ban for his bite on Giorgio Chiellini for Uruguay in the 2010 World Cup.