Luis Suarez appeared to bite Italy defender Giorgio Chiellini during the sides' 2014 World Cup Group D game on Tuesday.
Suarez, who has served two previous suspensions in his career for biting opponents, was not punished by Mexican referee Marco Rodriguez despite Chiellini's protests. The Italy player pulled his shirt from his shoulder in order to highlight the bite marks to the referee.
Moments later, Uruguay took the lead against Italy, who earlier had Claudio Marchisio sent off, through a Diego Godin header and went on to win 1-0, qualifying for the round of 16 at the expense of their opponents.
Suarez previously served a 10-game ban for biting Chelsea defender Branislav Ivanovic while playing for Liverpool in the Premier League as well as serving a seven-game ban for a similar incident while with Ajax.
Suarez, who was Ajax captain at the time, bit PSV Eindhoven midfielder Otman Bakkal's shoulder during a 0-0 draw in 2010.