NSW Health authorities are set to decide what restrictions on movement and gatherings will be in place on Christmas Day, after a day of record testing across the country yielded just 21 cases of COVID-19 nationally.
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In NSW, eight cases of the virus were recorded in the community, including seven related to the northern beaches outbreak and one nurse who had been involved in transporting patients in hotel quarantine.
ACT authorities will be watching the NSW announcement closely, after the Avalon beaches cluster grew to 90 cases.
ACT Policing manned the Federal Highway monitoring for people coming from Sydney in breach of the public health order for the first time on Tuesday, in a "booze-bus style" operation.
Extra police were also sent to patrol Manuka Oval on Tuesday night to prevent cricket fans from Sydney's coronavirus hotspots sneaking into the venue.
More than 300 people will be forced to self-quarantine in Canberra after declaring they were in the NSW hotspots of Greater Sydney, the Central Coast and Wollongong.
ACT Health has received more than 860 self-declaration forms, but many of those people won't need to quarantine as they are only transiting through Sydney en route to Canberra.
NSW Premier Gladys Berejiklian said it would be unlikely regional NSW would experience any changes to its level of restrictions on Wednesday, and the announcement would cover the future of the lockdown in the northern beaches area and the limit on gatherings of 10 people in households across greater Sydney.
The number of exposure sites has spread into regional NSW, with a traveller returning to Victoria from the northern beaches stopping at Oliver's Real Food in Gundagai on Friday before testing positive on the weekend.
Another person who later tested positive was at a number of locations in Orange on Saturday.
While signs pointed towards some restrictions being eased by Christmas Day, thousands of people are likely to still be in self-isolation instead of spending the occasion with loved ones.
Despite the low number of cases, Ms Berejiklian said the threat of future cases outside the suburbs surrounding the original outbreak remained.
"What remains our concern is that even though the case numbers are relatively low compared to what we've experienced in previous days, the number of venues that are impacted grows, because when you have people with the virus who have attended venues outside of the northern beaches community, it always increases our concern to make sure there isn't a permanent seeding event created by any of those venues," she said.
Australia's chief medical officer Paul Kelly was buoyed by the 76,000 tests across Australia.
"That's how we're going to find this virus," he said.
"We really want you, if you are symptomatic, get tested."
Ahead of the Big Bash clash on Tuesday night Venues Canberra moved to block people from Sydney and the surrounding region attending the match after quarantine rules for travellers came into effect.
Fans from NSW's affected areas had their tickets to the clash between Sydney Thunder and Perth Scorchers cancelled, and police were called in to help prevent banned spectators somehow entering the venue.
Fans from NSW's affected areas have had their tickets to the clash between Sydney Thunder and Perth Scorchers cancelled.
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Ticket sales for the clash were halted at 6pm on Monday.
Ticket holders who can prove they haven't come from one of the designated NSW local government areas will be allowed to enter.
Venues Canberra chief operating officer Matt Elkins said event staff including media, cleaners, catering and security would be required to complete a declaration form on arrival at Manuka Oval.
People arriving in ACT from Greater Sydney, Central Coast and Wollongong are required to go into 14 days of mandatory quarantine, under rules aimed at shielding Canberra from the northern beaches cluster.