Victoria has recorded nine new cases of coronavirus but no deaths.
The state's death toll from the virus remains at 806 and the national figure at 894.
The figures, confirmed by the Victorian Department of Health and Human Services on Monday, bring Melbourne's 14-day average to 11.6.
There have been 13 mystery cases in Melbourne between September 19 and October 2.
Melbourne needs a 14-day average of fewer than five cases as well as less than five mystery cases for restrictions to further ease on October 19.
Chief Health Officer Brett Sutton on Sunday said there were three new mystery cases in postcodes 3145, 3023 and 3019 and urged anyone in the areas with symptoms to get tested.
He said a single case of unknown origin might represent 10 or 15 true cases in the community.
"It's really a call to arms ... anyone in those postcodes should be aware that there's transmission in those postcodes," he said.
Premier Daniel Andrews said he was "as confident as you can be" that the state's 14-day average would drop to fewer than five daily cases in a fortnight.
"Regional Victoria is in a different place today than they were three or four weeks ago. And hopefully on 18 or 19 October, so just in a couple of weeks' time, metro Melbourne will be in a different place than they are right now," he said.
© AAP 2020