NRL boss Todd Greenberg has promised to ban for life anyone found guilty of match-fixing.
The game was on Thursday thrown into turmoil when NSW Police confirmed they were probing allegations of match-fixing.
And Greenberg said the game's administrators would come down with their full weight on anyone found guilty of conspiring to fix the outcome of a game.
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NRL promises life bans for match-fixing
"This is a threat which exists for all sport in this country and globally," Greenberg said.
"The response from the NRL will be very clear. If any allegations are proven, then we will ban anyone found guilty, for life."
Police are reportedly probing two 2015 games involving Manly - their round 16 20-8 loss to South Sydney and their round 24 20-16 defeat against Parramatta.
Greenberg said he had not been aware of any specific allegations and the police investigation was in its early stage.
He said airing any preliminary allegations ran the risk of casting a pall over innocent people.
"There is no specific allegation yet, no charges, no formal investigation by police and we should be careful not to jump to conclusions," Greenberg said.
