The DHHS lists "high-risk" locations and has advised those that visited Benalla White Line Tyres, 73 Carrier Street, on September 30 should monitor for symptoms, with the person who later tested positive having attended the premises for 90 minutes around midday.

The case relates to a person with a Melbourne residential address who visited Kilmore and then Benalla.

That person visited Kilmore Oddfellows Cafe, 36 Sydney Street for breakfast on the same day, September 30.

Chief Health Officer Brett Sutton confirmed in Monday's press conference that the person did have a permitted reason to be outside of Melbourne.

Benalla White Line Tyres advised on Facebook on Monday morning a "supplier from Melbourne was at the shop who has since tested positive for Covid-19".

"Due to the length of time he was on site I have been classified as a close contact. I have since had a test done which returned a negative result but due to DHHS guidelines I still have to quarantine for 14 days," the post read.

"Unfortunately the shop will be closed for the duration so if you can hold out until after the 15th for any tyre needs that would be great."

A post from the Kilmore cafe's Facebook page on Sunday evening stated they were notified of the positive test on Saturday, after the visit last Wednesday.

"On Wednesday morning at 9.15am we had a customer in transit from Melbourne visit our cafe for breakfast, he was there for approximately 45 minutes. He has since tested positive to Covid-19 & we were informed yesterday of this," the post read.

"Our staff & our customers are classed as very low risk. We've been in constant contact with government departments plus council etc to put in place everything we need to.

"All our customer contact tracing has been done through GV health, while closing early yesterday & over today while closed we have completed our deep cleaning. We will also be closing tomorrow more for a mental health day as it's been a very stressful 24 hours.

"The customer who was with us Wednesday morning was not from Kilmore or regional Victoria. Moving forward all customers we do not recognize will be asked to provide ID. Metropolitan Melbourne even if obtaining a work permit are legally not allowed to dine-in in regional Victoria."

Dr Sutton said he would not disclose which Melbourne LGA the person, who was a close contact of the Chadstone cluster, was from.

"I don't want that individual to be potentially identifiable," he said.

"Obviously the numbers of people who are in Kilmore and who visit Kilmore are pretty small.

"The Chadstone outbreak speaks to the complexity of the outbreaks we deal with here in Victoria - very different from our first wave, really quite different from other jurisdictions.

"The Chadstone outbreak [is] across workplaces, across households ... and into regional Victoria."

Dr Sutton said "anyone who comes from metro Melbourne carries their restrictions with them and should be getting takeaway only".

There were nine new cases reported on Monday, three of which were linked to a cluster or complex case and six which were under investigation.

There remained no mystery cases in regional Victoria, and the average number of cases diagnosed in the last 14 days for the regions is 0.3

Dr Sutton said investigations were continuing into a "weak positive" COVID-19 case in Shepparton, the only new case in regional Victoria with there being four active regional cases in total.

"It's turned up as a positive not on a point of care test, where you get an immediate result, but on a rapid result test that's done locally," he said.

"That said, the result has a high CT value. A high CT value can sometimes mean it's like a weak positive.

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"It may end up being a negative ... but we're working through that process.

"The case has been re-tested, there will be a formal test that goes to our reference lab here in Melbourne, the close contacts are being tested and for those who have a result, they've been negative, but there's also some pending results.

"We respond with some urgency ... particularly in regional Victoria, but all I'd say is its not a definitive positive as this stage."

On Sunday, Mitchell Shire recorded a new case, however it was linked to a known cluster and therefore the person appears to have contracted the virus from the person who travelled to Kilmore and Benalla on September 30.