"Where we decide to play those games and when we decide those games are all things that are being considered right now, but Nines has a future.
"It has a future at the elite level, and it certainly has a future at the participation and grassroots level. We plan to grow it as best we can."
Melbourne, Brisbane and Sydney are among the candidates set to put their hand up to host the event, with Auckland also to be considered.
With over $2.25 million prize money at stake, Greenberg said the financial rewards on offer was a massive boon for not only the governing body, but the game as well.
The winning team pockets $370,000, while teams receive a minimum $110,000 for turning up.
"It is a very healthy commercial venture for the game and the clubs," Greenberg said.
"Millions of dollars go back into grassroots footy through a legacy programme here in Auckland. But also our NRL clubs, they're all here taking a commercial return, as they should."