The NRL won't sanction Canberra coach Neil Henry over his criticism of referee Sean Hampstead following Monday night's loss to Cronulla.

Henry was scathing in his assessment of Hampstead's performance, claiming the veteran referee had huge problems in controlling the ruck area.

Henry's frustrations were compounded by his Raiders side turning what looked like a dominating 12-0 lead early in the game into a 36-24 loss.

NRL chief operating officer Graham Annesley said Henry had not broken any rules in criticising Hampstead.

"He didn't question his integrity, he expressed a view about his performance and there's nothing wrong with that," Annesley said.

Henry, who flew down to watch game from Terrigal where he is part of Mal Meninga's Queensland Origin set-up, claimed Hampstead was not up to first-grade standard.

"I just think he, as a referee, is way off the mark," Henry said.

The Raiders were also upset that a tackle from Misi Taulapapa on skipper Alan Tongue was not placed on report, their anger heightened after the Cronulla winger was cleared by the match review committee.

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