The incident, shown on television replays, showed Suarez apparently bite the shoulder of Italy defender Giorgio Chiellini as the pair clashed in the Italian penalty area. It happened about a minute before Uruguay scored in the 81st minute.
Suarez was sanctioned with a heavy ban for biting Chelsea defender Branislav Ivanovic in the English premier League in 2013.
FIFA can sanction players for biting with bans of up to two years.
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