Liverpool's trouble-prone striker Luis Suarez sparked fresh controversy on Sunday when he appeared to bite Chelsea defender Branislav Ivanovic during the sides' 2-2 Premier League draw at Anfield.
The incident occurred mid-way through the second half, with Liverpool trailing 2-1, and saw the Uruguayan apparently sink his teeth into the Serbian defender's upper arm after a penalty-area tussle.
Ivanovic pushed Suarez away but referee Kevin Friend did not appear to see the incident and took no action.
Suarez had earlier been booked for a handball that gifted Chelsea the penalty from which Eden Hazard put them 2-1 up, but he finished the game by heading in a dramatic equaliser in the seventh minute of injury time.
Liverpool manager Brendan Rodgers said he was not in a position to comment on the incident and said he had not discussed it with Suarez.
"The only comment I can make at this stage is that we'll review it, we'll look at the video, and then we'll make a comment," he told Sky Sports.
"I've only just come in after the game and seen the opportunities from a football perspective, but once we've reviewed that, we'll make a comment on it. Until you review it, you can't speak about it."
Chelsea interim manager Rafael Benitez, the former Liverpool manager, also refused to comment on the matter.
"I didn't see anything. I was just concentrating on the game, so I didn't see," he said when asked about the incident.
Suarez, 26, has regularly hit the headlines since joining Liverpool from Dutch club Ajax two years ago.
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.
In an apparent precursor to Sunday's incident, he was once banned for seven games for biting PSV Eindhoven player Otman Bakkal while playing for Ajax during a Dutch league game in November 2010.
He left Ajax for Liverpool before he could complete his suspension.