The Andrews government and health authorities are deliberating over whether to send Victoria into its sixth lockdown.
The discussions come after Victoria recorded six new coronavirus cases in the 24 hours to midnight on Wednesday, three of which are yet to be linked to known outbreaks.
The Australian understands more positive test results have since been received by the health department.
Victorian Health Minister Martin Foley, Covid-19 logistics chief Jeroen Weimar and former AMA president Mukesh Haikerwal are due to address the media at 11.45am.
Dr Haikerwal runs a GP practice in Altona North, in close proximity to communities affected by the latest cases.
However, any announcement about a snap lockdown is not expected until later on Thursday.
The latest cases include a teacher in her 20s who works at Al-Taqwa College in Truganina in Melbourne’s outer southwest, and her husband, who works as an optometrist in Caroline Springs in the outer west.