Harry Grant has been labelled a "cheat" by NSW's most successful State of Origin coach on the eve of Game III, with the Melbourne Storm hooker's habit of pressuring referees placed firmly in the spotlight.

The pointed accusation was made on the 100% Footy television program, where the veteran NSW mentor took direct aim at Grant's on-field conduct, suggesting his persistent harassment of match officials gives him an unfair advantage.

The comments are set to add fresh intensity to an already highly charged series decider, with Grant widely regarded as one of the most influential players in Queensland's arsenal heading into the deciding clash.

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