Of the 11 new cases, confirmed in the 24 hours up until midnight on Sunday, just one was in isolation throughout their infectious period.

However, all cases are confirmed links to existing clusters.

There has now been 51 new cases in the last three days.

There were 38,987 tests returned on Sunday and 17,101 vaccine doses administered.

Most of the cases in the current outbreak are centered around the western suburbs in Melbourne, with no reports of the virus seeping into regional Victoria yet.

Melburnians will be the first Australians able to receive a COVID-19 vaccine while behind the wheel of their car, with a drive-through clinic set to open at a former Bunnings warehouse.

However, there are not yet any plans for such a setup in Ballarat.

Motorists and passengers will be screened for eligibility and symptoms at the entry to the car park of the Melton site before proceeding in batches of 10 cars to an identification check-in point.

They'll then park and receive their jabs and will be asked to remain under observation in the vehicle until given the all clear.

The facility is initially expected to administer 10,000 vaccine doses a week, with hopes it will be the first in a series of drive-through hubs.

Announcing that Victoria had added 11 locally-acquired infections to its caseload on Sunday, Premier Daniel Andrews also said residents under 40 would be offered AstraZeneca jabs at nine of 50 state-run clinics.

In addition, children aged 12-15 with underlying health conditions or of Aboriginal or Torres Strait Islander descent will be allowed to receive Pfizer doses.

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"There are many appointments available, go online," Mr Andrews urged of anyone considering the AstraZeneca offer.

With the best part of 200,000 vaccinations on hand, anyone within the age group willing to provide informed consent would be able to receive a first AZ dose and a second 12 weeks later, he said.

Echoing the premier's encouragement, Chief Health Officer, Brett Sutton said: "I'm a 52-year-old bloke. If I were 25 and AstraZeneca was the only vaccine available to me today, I would get it."

Victoria administered 17,360 vaccine doses in the 24 hours to Saturday evening and conducted 38,179 tests.

All 11 new infections have been linked to previously reported cases although they were not in quarantine while infectious.

However a localised outbreak in a Melbourne public housing tower appears contained, with residents tested by Sunday morning returning negative results.

See the exposure sites here.

Mr Andrews said families isolating on the 17th floor of the tower at 130 Racecourse Road in Flemington had all been tested.

"All returned a negative test result so that's very pleasing," he said.

"It doesn't mean we are out of the woods there, doesn't mean we can change the settings, but better to have negative results than positive."

Professor Sutton said 17 immediate family members had been cleared as well as an additional 200 residents throughout the complex.

The tower was identified as a tier two location between August 3 and 6 and was previously placed under strict lockdown in early July. Eight cases were found in a single family within the building on Friday and immediately placed in quarantine.

Meanwhile, Mr Andrews says no decision had been made on whether Victoria can emerge from lockdown, as planned, on Thursday.

He says he remains concerned by two mystery cases behind the latest outbreaks.

"We've just got to monitor this every single day," he said.

"We'll be in lockdown no longer than we need to be and we just have to take this one day at a time."

Prof Sutton said Victoria's latest cases were all linked to Melbourne's Hobsons Bay cluster seeded by a teacher at the Al-Taqwa College.

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