Striker Diego Costa has denied biting Gareth Barry during Chelsea's 2-0 FA Cup quarter-final defeat at Everton.
The Spaniard was sent off following the clash with the Everton midfielder in the 84th minute at Goodison Park.
In the incident that led to Costa's second yellow card, the 27-year-old confronted Barry, moving his head towards him and in the direction of his neck.
A Chelsea spokesman said: "Diego spoke to club officials and expressed regret over his reaction to the challenge from 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."