Victoria has recorded zero new locally acquired cases of coronavirus on Saturday as more than 28,000 people were tested in the past 24 hours.
The Department of Health and Human Services also revealed one new infection in returned overseas travellers in hotel quarantine.
There are 40 active cases of COVID-19 across the state. There were 28,337 tests undertaken in the past 24 hours.
The health department revealed on Thursday the mystery case announced on Wednesday had been genomically linked to the northern beaches outbreak.
But the source of acquisition for the case remains unknown and under investigation.
The number of active cases linked to the Black Rock Thai restaurant cluster remains at 27.
The number of people in isolation in Victoria because they are either positive cases or primary close contacts of cases stands at 2460.
There are now more than 200 testing centres in operation in Victoria, including a new testing site near gate one at the MCG.
Almost 180,000 tests have been taken in Victoria since the start of the year.