Deputy NSW Premier John Barilaro is not expecting an escalation in virus infection numbers after parts of his state went to a 14-lockdown.
Premier Gladys Berejikilian ordered the lockdown of Greater Sydney, the Blue Mountains, the Central Coast and Wollongong as the virus spread from the initial Bondi cluster.
Mr Barilaro is expecting similar numbers to those seen on Saturday and the day before that. There were 12 new COVID-19 cases reported on Saturday, taking the total number in the outbreak to 80 cases.
"This is what we thought would happen, that the numbers would be consistent, but what the issue is, is that the numbers, even though they are consistent on larger tests, is that they are coming from other parts of the city," he told Sky News' Sunday Agenda program.
"That why it is important that we locked down the whole city."
He is confident the two-week lockdown will be sufficient to suppress the virus.
However, he wasn't about to blame the outbreak on the federal government and the slow vaccine rollout.
"I think we are a victim or our own success for too long ... so there has been a level of complacency in the community to get the vaccine," Mr Barilaro said.
But he added there has been a lot of debate about AstraZeneca and that some of the narrative from the federal government hasn't helped.
NSW Health has issued an alert for passengers who travelled on five Virgin flights to and from Sydney, Brisbane, Melbourne, and the Gold Coast on Friday and Saturday after a flight attendant tested positive to the virus.
NSW residents in the lockdown zone are only allowed to leave home for work that can't be done at home, to shop for essential items, for exercise, to seek medical care or for care-giving or compassionate reasons.
Anyone in NSW who has been to Greater Sydney since June 21 is also being asked to stay at home for the lockdown period.
Exercise outdoors is allowed in groups of up to 10, and COVID-safe funerals can proceed with up to 100 people.
Weddings are allowed on Sunday with restrictions in place, but must be cancelled from Monday.
Ms Berejiklian urged people to abide by rules, saying police "will not be afraid to throw the book at anybody who does the wrong thing".
Health Minister Brad Hazzard warned people not to try to flee the lockdown areas either.
"If a police officer detects that you're there, and there's say five people in the car, that's potentially, if he decides you're going to court: $11,000 times five, a maximum fine (of) $55,000," Mr Hazzard said on Saturday
The premier urged people not to panic buy or stress about money, with shops to remain open and financial assistance to be available.
"It's never easy when all of us have to face these circumstances, but we're all in the same situation," she said.
Prime Minister Scott Morrison says special payments of $500 per week will kick in on Thursday for eligible people impacted by the lockdown.
© AAP 2021