The Victoria Department of Health is also investigating two probable cases of Omicron which were discovered in the Melbourne community.
The cases have a gene that is a signature of the variant of concern.
They have been identified in the regions of Casey and Brimbank.
Household contacts of the two cases have also tested positive for the coronavirus and whole genome sequencing has yet to confirm whether they have the Omicron variant.
None of the cases are linked to international travel and it is currently not known how they contracted the virus.
The government said it “takes a conservative approach in naming their contacts, including in non-family contexts.”
A number of contacts have been identified and ordered to self-quarantine for 14 days.
Other people at low risk of catching the virus have been told to get tested and self-isolate until they test negative.
While most people who come in contact with a confirmed case of COVID-19 outside their home in Victoria are not required to self-quarantine, contacts are embroiled in an ‘epidemic of worry’ , which means that the authorities can impose a longer quarantine period on them.