The NRL has warned club coaches about tirades against match officials but will take no action for comments made after the weekend's games.

Manly's Des Hasler, Canterbury's Kevin Moore and South Sydney's John Lang were all critical of referees after their sides' losses during round two.

Hasler was the most vocal, telling reporters he would pay for a touch judge to have his eyes tested after his side's 24-20 loss.

"Rugby league gives coaches far more latitude than most sports to question decisions and we believe that is the right policy," NRL chief operating officer Graham Annesley said in a statement on Monday.

"Referees understand that they are accountable but they should not have to accept accusations of bias, nor should they be subjected to public ridicule or abuse.

"There were a couple of comments this weekend that were at the edge of what we would allow before imposing substantial fines.

"The rules remain clear: if the integrity of the referee is challenged, if demeaning or insulting comments are used then clubs can expect to be fined."

NRL referees boss Robert Finch conceded his officials made two errors costing Manly and Parramatta points in Sunday's match at Parramatta Stadium.

Finch said the referees erred in awarding Manly's first try and an obstruction penalty should have been awarded to the Eels.

He also admitted the final pass for centre Joel Reddy's crucial try for Parramatta was forward.

"I'm pretty disappointed with the team's performance yesterday afternoon," Finch told reporters on Monday.

"There were two incidents in this game which led to points - the first being the first try that Manly scored which was clearly a breach of the key indicators.

"An obstruction should have been awarded against the Manly side and a penalty to the Eels."

"And the (Joel Reddy) try that the Eels scored ... the last part was clearly forward."

Finch said a decision on whether touch judge Gavin Reynolds would be dropped for round three would be made on Tuesday.

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