But he thinks it won't be able to lift any higher for the Canberra Raiders' likely NRL finals campaign.

It's all up to chief health officer Kerryn Coleman, who The Canberra Times revealed would reassess Canberra Stadium's capacity each week, but Barr said all the evidence from the crowds capped at 1500 and the 3000 that saw the Brumbies' victory over the Western Force on Friday night had him confident another increase could be made for the decider.

That would take Canberra Stadium out to the 25 per cent capacity Prime Minister Scott Morrison endorsed back in June.

It was on the verge of rising to that mark before Victoria's outbreak saw it kept at 1500 until this weekend.

Barr's government has adopted a more cautious approach, which has been vindicated by the fact there are currently no active coronavirus cases in the ACT.

But he wanted to have as big a crowd as possible for the Brumbies' grand final on September 19, which they earned the right to host with the final round of the regular season still remaining.

It's the first time they've hosted it since they beat the Canterbury Crusaders 47-38 in the 2004 decider.

"I would hope, given how well the 1500 and the 3000 has gone, provided the chief health officer is comfortable that it can be managed well - which I believe it could be - yes we could go to a larger crowd to reflect a national cabinet position around the 25 per cent capacity," Barr told The Canberra Times on Saturday.

"I don't think it's going to go beyond that, but somewhere between the 3000 and 6500.

"The chief health officer will make that determination working with Territory Venues, who run the stadium.

"It's a big stadium. You can certainly maintain the quarantine arrangements for the players on the Meninga Stand side and still have spectators dispersed.

"It's really noticeable the atmosphere of having people in the venue as opposed to having to have TV pre-recorded crowd noise in the background.

"It does make for a better experience for the players and those watching on TV as well.

"We all look forward to the day we can go back to watching sport the way we used to and we hope that's sooner rather than later.

"But in the meantime, if we can manage it safely - particularly for a final of a competition - you want to be able to do so."

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But Barr didn't think the capacity would increase beyond 6500 by the time the Raiders finals roll around.

They have five rounds remaining, starting with the Canterbury Bulldogs at Canberra Stadium on Sunday.

If they win they'll be fifth on the NRL ladder and on track to host a final - and they're still in the hunt for a top-four finish.

As with anything coronavirus related, Barr's comments come with the caveat that a day is a long time in the COVID-19 pandemic - let alone five weeks - so the landscape might be vastly different come October and the finals.

"I don't think so [it could go beyond 6500] at this point," Barr said.

"It's difficult to predict where things are in five weeks' time, but my understanding is that at this point that would be the upper limit.

"That would at least allow more Raiders members to attend. It certainly means no fans for the opposing team - other than the club board and the rest who will probably attend.

"But it will still give the Raiders a very distinct home-ground advantage during the finals."

In a sign of how much things have changed since the start of the pandemic, 6500 feels like a lot.

But the Raiders averaged almost 25,000 for home finals since 2010.

"We've got a wonderful, passionate fan base and the more we can get in there the better for them," Raiders coach Ricky Stuart said.

"They've been waiting a long time to get to a game live and it would be great getting them in there."

SUPER RUGBY AU ROUND 10

Saturday: ACT Brumbies v Queensland Reds at Sunsorp Stadium, 7.20pm.

NRL ROUND 16

Sunday: Canberra Raiders v Canterbury Bulldogs at Canberra Stadium, 6.30pm.

Raiders squad: 1. Charnze Nicoll-Klokstad, 2. Jordan Rapana, 3. Jarrod Croker (c), 4. Curtis Scott, 5. Nick Cotric, 6. Jack Wighton, 7. George Williams, 8. Josh Papalii, 9. Siliva Havili, 10. Dunamis Lui, 11. John Bateman, 12. Elliott Whitehead, 13. Hudson Young. Interchange: 14. Tom Starling, 15. Joe Tapine, 16. Ryan Sutton, 17. Matt Timoko. Reserves: 18. Sam Williams, 19. Harley Smith-Shields, 20. Kai O'Donnell, 21. Matt Frawley.

Bulldogs squad: 1. Will Hopoate, 2. Nick Meaney, 3. Marcelo Montoya, 4. Kerrod Holland, 5. Dallin Watene Zelezniak, 6. Kieran Foran, 7. Lachlan Lewis, 8. Ofahiki Ogden, 9. Jeremy Marshall-King, 10. Dylan Napa, 11. Josh Jackson, 12. Raymond Faitala-Mariner, 13. Aiden Tolman. Interchange: 14. Sione Katoa, 15. Renouf To'omaga, 16. Dean Britt, 17. Matthew Doorey. Reserves: 19. Luke Thompson, 20. Jack Cogger, 21. Reimis Smith, 22. Tim Lafai.