Millions of people in Sydney have woken to their first day of a week-long lockdown as authorities work to contain a coronavirus outbreak that has ballooned to 65 cases.

The list of exposure sites is growing too, with venues in the northern beaches, Lakemba and Auburn an another two train routes added overnight on Friday.

People who live or work in Woollahra, Waverley, Randwick and the City of Sydney council areas will not be able to leave home for a week except for essential purposes.

These include work or education, shopping, providing care or outside exercise.

The order took effect from 11.59pm on Friday and will last until 11.59pm on Friday, July 2.

Australian Chief Medical Officer Paul Kelly has also extended his declaration of Sydney as a hotspot, paving the way for Commonwealth support to be offered.

Coronavirus disaster payments of up to $500 kick in seven days after a hotspot is declared.

Eligible workers left without income in the seven local government hotspot areas will be able to access the one-off payment from July 1.

Treasurer Dominic Perrottet on Friday night also said he was looking at ways to provide support of affected businesses and workers.

NSW recorded 22 new local COVID-19 cases on Friday.

Eleven cases were detected in the 24 hours to 8pm on Thursday night, six of which were already reported. There were 17 further infections after 8pm which will be recorded in Saturday's tally.

Premier Gladys Berejiklian said authorities expect the number of cases to surge further, despite the lockdown.

"We expect household contacts to develop the virus," Premier Gladys Berejiklian told reporters on Friday after a crisis meeting to review the swelling figures.

"Our aim is to make sure that we get on top of any potential spread and that we also get on top of any chains of transmission that our testing hasn't picked up."

But the Australian Medical Association has said the current restrictions will not be enough to get on top of the outbreak, and it has called for the entire Sydney basin to be locked down.

Adding to the concern is confusion about the rules of the lockdown.

NSW Health Minister Brad Hazzard said on Friday that retail, weddings, funerals and community sport could continue in the restricted areas.

"Other non essential businesses and other services in houses of worship will cease," he tweeted.

Late on Friday health authorities added the Chinese restaurant Lotus Barangaroo to the growing list of exposure sites, ordering anyone who visited the venue on the afternoon of Sunday June 20 to isolate for 14 days.

People who have been to Lyfe Cafe at Bondi Beach, Lean Bean Fitness at Bondi, Moore Park View Hotel at Waterloo and Doncaster Hotel at Kensington at specified times must also isolate for a fortnight

Several shops and cafes in Barangaroo, Double Bay, Cecil Hills, Chipping Norton, Randwick, Zetland and Burwood were also added to the list, with people being told to test and isolate until they get a negative result.

A number of public transport routes were also affected.

Restrictions remain in place for other areas of Greater Sydney as well as the Central Coast, Blue Mountains, Wollongong and Shellharbour, while those who live or work in the Inner West, Canada Bay or Bayside council areas are still barred from leaving metropolitan Sydney.

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The NRL will place State of Origin players back in a biosecurity bubble to ensure Game II can go ahead in Brisbane on Sunday, after retrospective stay-at-home orders were issued for several parts of Sydney.

Queensland Health on Friday announced any arrivals who had been in four coronavirus-affected Sydney local government areas (LGAs) since June 11 must quarantine from 1am on Saturday.

That had an immediate impact on Origin, with the retrospective orders pre-dating when NSW left for their training camp just south of the Queensland border in Kingscliff on Monday.

James Tedesco, Latrell Mitchell, Damien Cook, Cameron Murray, Angus Crichton all play for clubs in the Sydney LGA.

Queensland forward Jai Arrow is another to fit that category, and would have been at South Sydney training at Redfern since June 11.

As a result the NRL has implemented the same level-three restrictions the game was played under at the end of last year, with clean and dirty zones in the stadium

"We are dealing with the Queensland government and adapting to their change in protocol," ARL Commission chairman Peter V'landys told AAP.

"We are confident of the outcomes. The Queensland government has been extremely professional with us and cooperative.

"We will continue to work with them. We don't believe there is any problem with the game."

V'landys and NRL staff were set to fly home before the orders come into place, with their office at Moore Park situated inside the City of Sydney LGA.

The Blues are already without doctors Nathan Gibbs and Paul Arnett and physio Travis Touma after they were unable to enter Queensland from the hotspot areas.

It is unclear what the ban on people who live or have visited Sydney, Randwick, Waverley or Woollahra LGAs since June 11 will have on key production and match-day staff.

The changes come after players in Sydney were placed into level-three restrictions earlier in the week in a bid to avoid any major disruptions to NRL games in the city during the outbreak.

Origin III is still scheduled for ANZ Stadium on July 14, however, attention will likely turn to that next.

There are still four games planned for Sydney next week, after the Sydney Roosters moved their clash with Melbourne to Newcastle.

Remaining games are likely to be played with 50 per cent crowds at best, with that order extended until next Friday at least.

Meanwhile, the only international of the weekend - a clash between Lebanon and Malta at Belmore on Saturday - has also been postponed.

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A virus-infected Melbourne couple whose road-trip sparked a COVID scare in two states have been fined by NSW Police.

The couple, aged in their 40s, left their Melbourne home during a lockdown and travelled through regional NSW to Queensland.

The pair visited more than a dozen venues in NSW over four days, before they tested positive after their arrival in Queensland on June 5.

NSW did not shut its border with Victoria, but any travellers from the state were supposed to abide by the lockdown rules even in NSW.

NSW Police on Friday said the pair had visited various businesses deemed 'essential services', including retail stores, food outlets, and service stations.

But they had also attended the Reading Cinemas in Dubbo on June 2 - a non-essential activity - and would be fined $1000 each.

The pair were also fined $4000 each by Queensland Police earlier this month, for providing false information on their border declarations.

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Authorities are urgently trying to determine if any Australians were caught up in a horrifying building collapse in Florida amid reports a couple from Melbourne is missing.

Rescue crews are searching for survivors after an entire side of the 12-storey building in the Miami community of Surfside gave way while residents were asleep. At least one person is dead and about 100 are missing.

Joseph Waks believes an elderly Australian couple he's known for many years was in the building at the time.

He has not heard from them since the collapse and has been waiting at the scene for updates from police.

"We're hoping for the best, we're hoping there'll be a miracle," he has told the ABC.

He said the couple was originally from Sydney but later moved to Melbourne and divided their time between Australia and Miami, where they have family.

"They have been in and out of this community for many, many years," he said.

"It's devastating. They both became grandparents yet again a few hours before the tragedy. We still cannot believe it."

Danny Rivero, a reporter from National Public Radio in South Florida, tweeted on Friday: "We've been told many Argentinians and Australians were in the building as well, and that all are unaccounted for. This is an international disaster."

The Department of Foreign Affairs and Trade said it was aware of reports Australians may have been caught up in the disaster at the Champlain Tower South Condominium.

"The Australian embassy in Washington is closely monitoring developments and making urgent enquiries to determine if any Australians were affected," it said.

Surfside is a community of 5700 residents with a large Jewish presence.

The Australian Jewish Association has been in contact with a committee member who is in Miami, staying near the collapsed building.

There are no reports so far of any Australian Jews being caught up in the disaster, a spokesman for the association told AAP.

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