Victorian Premier Daniel Andrews said the five-day snap lockdown had "worked" but would "need to work for a while longer".

"We will not be ready to lift this lockdown at midnight," he said.

"I know how frustrating this is but I can't tell you exactly what rules and what time frame will apply beyond midnight tomorrow night.

"The Chief Health Officer will provide advice to me and my senior colleagues. That will occur over tomorrow night and tomorrow morning and it will be based on the best information, the most complete set of facts we can possibly pull together."

The announcement comes as the state recorded 13 new coronavirus cases, including a staff member at St Margaret's Berwick Grammar.

Six other schools have been listed as exposure sites, including Bacchus Marsh Grammar, Barwon Heads Primary, Kew's Trinity Grammar School, Murrumbeena's St Patrick's School and Malvern's De La Salle College.

Health authorities also fear the Melbourne outbreak has spread to regional areas after a man from Mildura presented with COVID-19 symptoms at a hospital after attending the Carlton and Geelong match at the MCG last Saturday.

There are currently 72 active cases in Victoria, 15,800 primary close contacts in isolation and there are more than 250 exposure sites stretching from Phillip Island to The Mallee.

54,839 test results were received in the 24 hour period until Monday morning.

South Australia, Western Australia, Queensland and Tasmania have reinstated border restrictions with Victoria.

Victorian workers and businesses who have lost work or income during Victoria's fifth lockdown are eligible to receive commonwealth support payments.

Under recent amendments to the scheme, Victorian workers who have lost 20 or more hours of work will be eligible for $600 while those who lose 8-20 hours will receive $375.

Warrnambool and south-west residents can find their closest vaccination centre here.

Our journalists work hard to provide local, up-to-date news to the community. This is how you can access our trusted content: