Liverpool striker Luis Suarez on Sunday apologised for biting Chelsea defender Branislav Ivanovic during the sides' 2-2 Premier League draw at Anfield.
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The incident occurred mid-way through the second half, with Liverpool trailing 2-1 following a tussle in the penalty area.
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"I'm sad for what happened this afternoon, I
apologise (to) Ivanovic and all (the) football world for my inexcusable behaviour. I'm so sorry about it!!," the controversial Uruguayan said on his Twitter account.
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"I apologise also to my manager, playing colleagues and everyone at Liverpool Football Club for letting them down," he added.
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Referee Kevin Friend did not appear to see the incident and took no action, despite Ivanovic attempting to show him the bite-marks on his arm.
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Suarez had earlier been booked for a handball that gifted Chelsea the penalty from which Eden Hazard put the visitors 2-1 up, but he finished the game by heading in a dramatic equaliser in the seventh minute of injury time.
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Liverpool managing director Ian Ayre commented:
"Luis has made an unreserved apology for his actions today.
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"His behaviour is not befitting of any player wearing a Liverpool shirt and Luis is aware that he has let himself and everyone associated with the club down.
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We will deal with the matter internally and await any action from the FA."
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Reds' coach Brendan Rodgers said on the club website: "Having reviewed the video footage and spoken to Luis, his behaviour is unacceptable and I have made him aware of this."
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Chelsea interim head coach Rafael Benitez, the former Liverpool manager, said he did not see the incident.
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Suarez, 26, has regularly hit the headlines since joining Liverpool from Dutch club Ajax two years ago.
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He has frequently attracted criticism for diving and was banned for eight matches after being found guilty of racially abusing Manchester United's Patrice Evra during a game in October 2011.
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In an apparent precursor to Sunday's incident, he was once banned for seven games for biting PSV Eindhoven midfielder Otman Bakkal while playing for Ajax during a Dutch league game in November 2010.
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He left Ajax for Liverpool before he could complete his suspension.
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Suarez's strike on Sunday took his tally for the season to a league-leading 23 goals, but Chelsea goalkeeper Petr Cech said his antics were sullying his reputation.
l was very irritated by his behaviour, while watching the game. Why on earth would a professional player bite a fellow player. He needs psychological checkup.
What he did was inexcusable i must say. It made absolutely no sense for that to happen. Were they wrestling or playing football?