REFEREES boss Daniel Anderson said NSW skipper Paul Gallen and Queensland half-back Cooper Cronk both committed "possible sin bin offences" in last night's State of Origin series opener.

As Queensland fans scream blue murder over Gallen's flurry of punches to Nate Myles that earned the Cronulla captain a grade two striking charge and one game ban, Anderson revealed he was "comfortable" with the on-field adjudicating and admitted that, like the teams, they weren't "flawless".

The boss of the referees said the NRL did not condone fighting, but was reasonably happy with the way issues were dealt with in Origin.

Anderson said Cronk could easily have been sin-binned for holding down James Maloney after the Blues five-eighth made a break in the 21st minute.

"I thought there were two possible sin bin offences last night," Anderson said.

"I thought the Cooper Cronk borderline professional foul tackle on James Maloney early in the game where the refs penalised him and that's all they did, they didn't use the sin bin.

"And I thought Paul Allen's was a possible sin bin offence as well, but the referees put him on report. The match review has charged him and it's been dealt with in that manner. I'm comfortable with both decisions."

Pressed on whether fighting would be tolerated in Origin in the future, especially given the fiery debate it's fuelled in each state today, Anderson said referees would simply officiate as they see it.

"I don't condone it at all. They're big games and the match officials adjudicated them as they see it," he said.

"It's a possible sin bin offence. Everything in the game is adjudicated as they see it on the night and no way does anyone here condone striking.

"In the end Paul has been charged by the match review and dealt with."

As for Gallen's claims that Myles has an illegal tackling style by leading with his head, Anderson said last night's game would be reviewed thoroughly but he'd yet to encounter any issues in the Gold Coast captain's game this year.

"With regard to Nate Myles, since I've been in the job here I haven't seen a single incident involving Nate in that manner at all in the NRL," he said.

"I haven't drilled down into the game last night, but I can definitely state I haven't seen anything in the NRL this year."