The positive case was believed to be an essential worker who had travelled from southern Sydney to work on a construction site at the Goulburn Hospital.

NSW Health said they are also investigating the movement of removalists who tested positive after travelling through Victoria and South Australia for essential work.

They have not confirmed whether they stopped anywhere in regional NSW.

But, Victoria's COVID-19 Commander, Jeroen Weimar said it is "theoretically possible" that removalists made a stop in NSW just before crossing the border.

NSW Health said it is working closely with its counterparts in Victoria and South Australia on the source investigation and contact tracing.

Another 89 cases were diagnosed to 8pm Monday, NSW premier Gladys Berejiklian confirmed at Tuesday morning's update, with 21 of those infectious in the community.

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A man in his 70s has also succumbed to the disease.

Speaking to media, NSW Health chief medical officer Kerry Chant said from the beginning they were concerned about the risk of "seeding" from the outbreak in Sydney to regional areas.

She said that was why rules around masks and visitors had been introduced.

"It does highlight why people can't be complacent about the risk anywhere," Dr Chant said.

"If anyone is going to the regions for essential work, they have to stay at home... all you can do is that essential work and go home.

"You can only go there and do essential work and get your essential food and groceries."

Ms Berejiklian confirmed during the press conference that an update on restrictions could come as soon as today, or by Thursday at the latest.

Yesterday, the Murrumbidgee Local Health District addressed local media about the "mobile workforce" that can see health workers travel from Sydney and Victoria.

Dr Timothy Gilbey said that they have strict processes in place to assess the risk of any staff coming into the region, and the COVID-19 panel considers the risk of staff members.

"In health, in particular, we do have movement of staff - doctors, nurses and other health professionals between Sydney and Wagga and also between Victoria and Wagga in certain circumstances," he said.

"That's been the case for the past 18 months and longer, and that continues to be a situation that we have needed to manage in terms of the risk that it presents to the community.

"Any staff member travelling from another area undergoes a rigorous assessment panel as to what their risk is, what their vaccination status is and what risk they might pose to the health service is."

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