Premier Daniel Andrews says he will not rule out lockdowns for the areas where the COVID-19 numbers are at their highest, including Brimbank, Hume and Casey.
The state has recorded 25 new cases overnight, the highest for a number of weeks.
Health authorities attribute it largely to household gatherings of families and “family to family transmission”.
Mr Andrews re-imposed restrictions limiting the number of guests at a household to five after a new spike of coronavirus cases. It was previously 20.
In an impassioned plea this afternoon, Mr Andrews said he was “saddened” to have to reimpose the household gathering limits.
But it was a “problem occurring at a household level”.
Restrictions were due to be eased on Sunday night at 11.59pm.
Chief Health Officer Brett Sutton said the state is at a crossroads and we are at risk of a second peak.
“It’s a very significant increase from where we have been previously,” he said.
Victorians should still work from home if they can.
Gyms will reopen as planned on Monday, but restaurants and cafes, museums and libraries will have their number of patrons capped at 20.
Community sport for kids will still go ahead.
And here's a guide to the changes and timelines: pic.twitter.com/2UBsqdOwWc— Dan Andrews (@DanielAndrewsMP) June 20, 2020