Ms Ley initially considered heading home to Albury for a second 14-day quarantine period in recent times after the ACT entered a snap seven-day lockdown from 5pm last night.

But she joined Ms Haines in staying in Canberra with the next parliamentary sitting week starting on August 23.

A Canberra man in his 20s was identified as the initial positive case with confirmation three close contacts of the man also tested positive to COVID-19.

Stay home orders apply to anyone who was in Canberra on or after Sunday with federal parliament sitting this week and concluding yesterday.

"As the ACT is going into lockdown, I will be abiding by the stay at home restrictions," Dr Haines said.

"I had been planning on staying in Canberra next week, before another sitting period begins on August 23, as going home to Victoria would require me to quarantine for two weeks, forcing me to miss that sitting period.

"I'm committed to representing the people of Indi in Parliament, and that means being in Canberra to make sure our interests are protected."

IN OTHER NEWS

Ms Ley recently did a 14-day quarantine period after returning from the UNESCO World Heritage Committee meeting in Europe.

"The ACT has now declared Albury and the rest of NSW as COVID-affected, which means Sussan may not be permitted back into the ACT without quarantining for 14 days, missing parliament's next sitting period," a spokesman said.

"She is now remaining in Canberra under the stay-at-home, essential worker rules."

Meanwhile, NSW Deputy Leader John Barilaro addressed increasing speculation of a statewide lockdown after the virus had breached Greater Sydney in recent days and parts of regional NSW already in lockdown.

"We don't want to punish local government areas that haven't got the cases," he told Sydney's 2GB.

"When we see a risk we make those decisions.

"A statewide (lockdown) is probably still ahead of us, but I would consider a statewide lockdown if there were too many cases.

"At the moment it seems to be the central west, the west and the north, nothing down south, fingers crossed.

"But we do have a case in Canberra and that could become problematic for southern NSW."

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