NRL boss David Gallop reminded players of the need to conduct themselves properly in public but said there'd be no further investigation into an incident involving North Queensland's Johnathan Thurston.

The Cowboys star had reportedly been flicking beer at agitated team mate Willie Tonga at a Darwin bar in the early hours of Wednesday morning.

While Cowboys officials dismissed the incident as "minor", Thurston's position as captain at the club had already been under review following his alcohol-related arrest outside Brisbane's Casino in September.

Gallop, who was in Brisbane on Thursday to help launch some initiatives to assist victims of Queensland's recent floods and cyclone, said he was satisfied with the Cowboys' version of events and would not being taking the incident any further.

"It appears to be a pretty minor issue and I'm happy with the way the Cowboys have dealt with it at the stage." Gallop told AAP.

"It's a reminder that players need to be careful how they behave when in public and it's also a reminder that sometimes they can come to the attention of people for something that is of a very minor nature."

The Cowboys board in expected to announce if Thurston will retain the club captaincy for 2011 in the next fortnight.

Coach Neil Henry said there would be no further investigation into the Thurston incident because there was "nothing in it".

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