Parramatta coach Brad Arthur could find himself in hot water after lashing out at the NRL referees over Corey Norman's costly sin-binning in their 32-16 loss to North Queensland.

Arthur defied the NRL's recent edict not to criticise the officials when he declared that fans had been robbed of an even contest in the wake of his five-eighth's sin-binning for a professional foul on Michael Morgan.

He bemoaned the lack of consistency from the whistle-blowers and said he would ask NRL referees boss Tony Archer for a please explain.