The NRL says it is cooperating with police following reports of suspicious betting activity on a match this year.
Police said their investigation into match-fixing allegations is in its early stages and the NRL has urged the public not to jump to conclusions.
In a statement, the NRL said it would cooperate with authorities in relation to match-fixing allegations.
"Our position has not changed ... we will take whatever action is necessary to protect our game," it said.
"Anyone convicted of match-fixing can expect to be banned for life but, at this stage, no one has been charged and we should avoid jumping to conclusions."
Earlier this year, the Organised Crime Squad confirmed it was already investigating allegations of match-fixing in two NRL games from last year.
The first was a round 16 game between Manly and the South Sydney Rabbitohs.
The other was a round 24 match between Manly and the Parramatta Eels.