The Football Association announced Monday that it is investigating a biting incident involving Liverpool striker Luis Suarez during a match.
The incident occurred during Sunday's 2-2 tie against Chelsea.
"The incident was not seen by the match officials and has therefore been retrospectively reviewed," the FA said in a statement. "It is alleged that the conduct of Suarez constitutes violent conduct, and it is the FA's contention that the standard punishment of three matches that would otherwise apply is clearly insufficient in these circumstances."
Suarez wrote on Twitter and his Facebook page Monday that he has been fined for biting an opponent.
"For my unacceptable behavior yesterday, the club has fined me today," he wrote.
He also wrote that wants the undisclosed fine to be donated to families affected by the 1989 Hillsborough Stadium disaster, which killed 96 Liverpool fans.
Suarez apologized to Chelsea's Branislav Ivanovic on Sunday for biting him on the arm during the match.
He also apologized to the team and Liverpool fans through a statement.
This is not the first biting incident involving Suarez. He was given a seven-match suspension for biting PSV Eindhoven midfielder Otman Bakkal in November 2010.