But the drama surrounding their decision not to have the shot and rather sign the NRL's modified waiver is clearly affecting Raiders Sia Soliola, Josh Papalii and Joe Tapine, who have been taken aback by the attention surrounding the issue.

It's believed some, if not all of them, would be willing to be stood down rather than have the injection.

According to NSW Health, the only requirement to have the flu shot is to enter an aged-health-care facility.

ACT Chief Minister Andrew Barr weighed in on Friday saying, while it wasn't high on his list of coronavirus priorities, the players should simply get the injection.

All three Raiders have signed the amended waiver, after objecting to the wording on the initial document, and it's believed that should be enough to keep them on the track.

That wouldn't be the case in Queensland, where the agreement with the NRL reportedly included the players having a flu shot.

It means the NRL have stood down three Gold Coast players, including Bryce Cartwright and Nathan Peats.

But at this stage that won't apply to the Raiders three, who have their own personal reasons for not wanting to have the flu shot - not necessarily due to religious grounds.

Interestingly, the ACT Brumbies are set to return to training next week and there's no requirement for their players to have a flu injection - although they all have.

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Prime Minister Scott Morrison said it was up to the states and territories what requirements would be put in place - although he did have sympathy towards a "no jab, no play" policy, which would ban players if they didn't get the flu shot.

"Ultimately the states and territories have to determine what the health requirements are as they apply to the NRL and if they were to be insisting on that I would think that was entirely reasonable," he said on Friday.

Barr said he'd barely put any thought into whether three rugby league players should have flu injections or not, but he thought there was an easy solution.

"The best advice is have your flu shot. I think the Prime Minister's approach is right," Barr said.

"In relation to the technicalities of being able to play football that's partly a matter for the NRL and then would partly be a public-health matter.

"I don't believe there are any games posed to be played in Canberra for some time so there will be time to work through those issues.

"So let me take that one on notice. I don't think it's a particular priority. I think there are 100 other things that are more important to the community than whether two or three footballers have had their flu shots."