Victoria has recorded 45 new cases of COVID-19 and five more fatalities overnight, taking the state's coronavirus death toll to 750.
A man in his 50s was among those who died. The others were a man in his 70s, a man in his 80s, and two women in their 90s.
All of the deaths were linked to aged care settings.
It is the eighth consecutive day the state has recorded a daily infections increase below 50, but an increase on yesterday's tally of 28.
Metropolitan Melbourne's 14-day case average is now sitting at 42.7, and regional Victoria's rolling average is 2.3.
Premier Daniel Andrews said there were now 920 active cases in Victoria, including 30 in regional Victoria.
Only one new case was recorded in regional Victoria overnight, Mr Andrews said.
Deputy Chief Health Officer Allen Cheng said while the number of new cases today looked high, 19 were reported in the Brimbank area, in Melbourne's west, and many were linked to aged care homes.
"We are relatively confident that this is in a closed setting and we do know who the contacts are and we are able to get on top of that quickly," he said.
Thirty-two of the 45 new infections are linked to known outbreaks, and the other 13 are still being investigated.
There are now 90 Victorians with coronavirus in hospital — down on yesterday's total of 97.
Authorities trying to 'get a ring around' Casey community cluster
Health officials are working to tackle a coronavirus outbreak in the outer south-east of Melbourne they say is driven by members of different households visiting each other.
An outbreak referred to as the Casey community cluster has 34 cases spread across five households in Hallam, Clyde, Narre Warren South and Cranbourne North.
No new infections were linked to the Casey community cluster today.
Jeroen Weimar from the Department of Health and Human Services said household transmission was the main driver of the outbreak's spread.
"We've seen in this particular cluster visiting of houses beyond the 5-kilometre radius, so these five houses in this particular cluster have had, unfortunately, some members of those households visiting other households," Mr Weimar said.
"It is that limited amount of contact, relatively infrequent contact, between these five households that has now meant that we have 34 people in five houses experiencing or living with a very real threat of the coronavirus."
Professor Cheng said local health services, communities and DHHS were working together to respond to the outbreak.
"I think that is a very encouraging start but we clearly need to make sure that we get a ring around these cases to stop onward transmission," he said.
Mr Weimar said there were a total of 90 active cases across the Dandenong and Casey local government areas.
Aged care still a challenge for health officials
Mr Andrews said there were 474 active cases linked to aged care, an increase of 10 from yesterday's reported total of 464.
The number of active cases among healthcare workers has fallen slightly, from 143 yesterday to 140 today.
Yesterday's daily infections tally of 28 was the state's lowest in about three months.
Metropolitan Melbourne is scheduled to have some restrictions eased on September 28 if its 14-day average remains in the 30 to 50 range.
Many businesses across regional Victoria have started reopening after stepping out of stage 3 restrictions yesterday.
In order for Melbourne to progress to the next stage of its restrictions "roadmap" on October 26, Victoria needs to record fewer than five "mystery" cases over a 14-day period.
Regional Victoria will progress to the fourth step of its roadmap, scheduled for November 23, when there are no new cases at all across the state for 14 days.
