Cases in the state rose by 723 on Thursday, 660 of which were under investigation, and others were linked to known outbreaks, particularly in aged care and abattoirs and meat processing facilities.

Acting Chief Health Officer Paul Kelly has acknowledged that taking further measures in the city would need to consider how it affected the livelihoods of people in essential industries as well as wider supply chain issues.

The Australian Health Protection Principal Committee considered movement modelling, but Professor Kelly wouldn't give detail on what advice would be presented to government.

Restrictions are already increasing in Victoria, with face-coverings to become compulsory across the state when in public, not just Melbourne, from 11.59pm on Sunday night, and limits on socialising in and around Geelong, where cases are on the rise.

It also appears increasingly likely the original six-week lockdown timeframe for Melbourne and the Mitchell Shire will be extended as Prime Minister Scott Morrison acknowledged case numbers were not dropping as hoped.

People living in six local government areas surrounding the regional city of Geelong will be banned from having visitors in their home or visiting other homes from midnight tonight, as half of the cases in regional Victoria were recorded in the area.

People in the Colac-Otway, Greater Geelong, Surf Coast, Moorabool, Golden Plains and the borough of Queenscliff will be under the new rules, after authorities said data showed transmission at homes was the biggest source of new cases outside transmission at workplaces.

Victoria's death toll from this virus has increased to 105, with 13 cases added to the tally on Thursday. Ten of those were in aged care.

Cases connected to aged care facilities grew significantly, with 913 active cases connected to the sector including staff and residents.

Of the active cases in the state, 255 are in regional Victoria and 159 of those cases are in the Geelong corridor, leading the government to announce the new restrictions.

Hospitality venues will remain open and community sport will continue in the areas with the new restrictions, Mr Andrews said the decision on home visits came from the data about how the disease was spreading in those areas.

Despite the state government introducing payments for people without leave entitlements from work if they need to get tested or contract the virus, Mr Andrews said defence personnel who had doorknocked known positive cases had found people were at work instead of being at home.

"If you're a positive case, then you need to be at home and you need to be isolating, and that is a very important message," he said.

"To have found even one person who had disregarded their diagnosis and instead had decided to go to work is very disappointing."

"We are not judging them, just asking them, there is support for you and please don't go to work if you have symptoms. That is our request of you and I cannot be any clearer. If it continues than these numbers will continue to go up."

Mr Andrews said cases would continue to grow and restrictions would stay in place as long as people continued to work when they had symptoms, were awaiting test results or had tested positive.

He signalled the lockdown measures for Melbourne and the Mitchell Shire could be extended after initially being put in place for six weeks.

"Ultimately, every Victorian, I think deep down knows and appreciates that unless everyone plays their part this lockdown will not end anytime soon."

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Prime Minister Scott Morrison said the increasing cases in the Geelong region were of "great concern".

He also acknowledged the likelihood that the lockdown could continue.

"We have now been in this lockdown now for some weeks, and we are not getting the results we would hope for. And as a result the further measures that are taken are certainly necessary," Mr Morrison said.

"They will come at an impact to the economy - we understand that. But, equally, not containing these outbreaks will have that effect also. And so it's important that we continue to work together to get on top of this and to take whatever actions are necessary."