Queensland halfback Johnathan Thurston is at the centre of an investigation into an alleged street brawl in the early hours of Sunday morning.

Police were called to a street fight involving four people on Sturt street at 4am, with one man sent to Townsville hospital suffering tooth damage before being discharged.

The incident will be investigated by police, but they would not confirm whether Thurston was involved.

The NRL confirmed late Sunday they have been advised by North Queensland chief executive Peter Parr that the club were looking into an incident involving Thurston after the Cowboys' 26-24 come-from-behind win over Cronulla on Saturday night.

Cowboys media manager Tim Nugent said he had not been alerted to the altercation when contacted by AAP while Parr did not immediately return phone calls.

"I'm not aware of any altercation occurring," said Nugent.

"Certainly as far as I'm aware I haven't been rung by any police departments or anything of that nature.

"Normally I am notified."

Nugent said Thurston was present at the club's recovery session at 1pm Sunday, but the incident had not been raised and the 24-year-old appeared no different.

"He did not look any more bashed up than players look after a very, very tough game of football against the Sharks," he said.

Thurston will be named at halfback for Queensland when their State of Origin team is announced on Tuesday.

He won't play for North Queensland next Saturday against the Sydney Roosters in Sydney because of his Maroons' commitments.

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