The league is also exploring whether the World Club Challenge or Super League games could be included as part of the second annual foray into the American market.
Brisbane, the Sydney Roosters, South Sydney and Manly were chosen as the guinea pigs in the NRL's Las Vegas experiment, carried out across two games at Allegiant Stadium this month.
While US television ratings were lukewarm, the event proved a pilgrimage for overseas NRL fans, with a healthy contingent of the 40,000-strong crowd journeying from Australia.
The NRL is keen to entice another batch of travelling fans next year and is hopeful a prompt announcement will provide ample planning time.
"We're hard at work on finalising who the four clubs will be," said NRL chief executive Andrew Abdo.
"We don't have anything to announce just yet but we don't want to sit on it and we want to make sure that we bring that to a head in the next couple of weeks.
"We want to build and make this even bigger and have the opportunity for even more fans to go to next year's event and give them as much time to plan."
The Roosters have already indicated their interest in returning to Las Vegas after winning their match against the Broncos, while the Sea Eagles are keen to take at least one year off.
The NRL appears likely to select at least one non-NSW team, with Melbourne and Canberra indicating their interest in playing this year and the former coming close to selection.
Penrith appears a natural choice given their ability to showcase a high-quality brand of football.
The triple reigning premiers will also be forced out of Penrith Park amid redevelopments in 2025 so appear unlikely to be fazed by the prospect of giving up a home game.
The Las Vegas Nines competition and combine for prospective NRL recruits are likely to feature as part of the weekend again.
"Clearly we want to make as much noise in America as possible, to welcome new fans into the game," Abdo said.
"We want to have more people at the stadium, we want to have more people in America watching and following the game, those are the two key metrics that we're working on."
The NRL will get creative as they look to make the event bigger and better in 2025 at the urging of the Australian Rugby League Commission chair Peter V'Landys.
The World Club Challenge could be an option for inclusion on the program, given the clash of NRL and Super League champions is usually held at a similar time period.
"(We're) looking at the World Club Challenge, looking at Super League games and also considering how we can get female athletes participating in America eventually," Abdo said.
"Those are some of the priorities the Commission have challenged us to come up with so we're hard at work."
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