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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.

© AAP 2021

Image credit: Grant Broadcasters