The new cases take the number of active local cases in the state's latest outbreak to 72, with two others recovered.
Health officials are still seeking to pinpoint the source of several mystery cases, with concerns surrounding the highly infectious Delta strain remaining.
Victoria recorded five new locally acquired cases in total on Saturday, with three close contacts of existing cases.
The state's list of exposure sites has swelled to almost 400 overnight after a Woolies, Coles and city office building were added.
Covid fragments were also found in wastewater samples from Melbourne's inner west and north catchment area, a detection described "of interest" to health authorities.
The suburbs have no confirmed cases of coronavirus but it is near the West Melbourne Delta strain mystery cluster.
"The unexpected detections may be due to someone who has had Covid-19 that is no longer infectious continuing to shed the virus or it may be due to an active but undiagnosed infectious case," the health department said.