Victorian MPs will have to swear allegiance to King Charles III when they return to parliament for one last stretch ahead of the state's November poll.
The long-serving monarch died aged 96 at Balmoral Castle in the Scottish Highlands.
Her death has triggered widespread mourning across Australia but has immediate practical implications for Victoria's parliament.
The state legislature is scheduled to return next week for its final three sitting days before the November state election but it cannot resume until MPs swear allegiance to King Charles III.
After laying a wreath with wife Catherine at Government House, Premier Daniel Andrews confirmed Governor Linda Dessau will make an official proclamation early next week before MPs can be re-sworn.
"Presiding officers will work through those issues and we'll find a respectful way to deal with those three sitting days," he told reporters at state parliament on Friday.
"There's every chance that we don't sit next week ... but we'll make up those days."
However, Mr Andrews indicated parliament could briefly sit on Tuesday to re-swear MPs and move a condolence motion before adjourning to a later date, in keeping with when King George VI died in 1952.
In an email to MPs, Legislative Council President Nazih Elasmar and Legislative Assembly Speaker Maree Edwards suggested that was the most likely scenario.
"Members of the council and assembly must be sworn by oath or affirmation after the successor is proclaimed by the governor," they wrote.
"This proclamation is likely to happen in the next one to two days. On that basis, swearing in would take place next Tuesday in both chambers."
Victoria is the only state or territory in which MPs are required to swear allegiance to the new monarch following the predecessor's death.
There will not be a state memorial service for the Queen but sites are expected to be set up for Victorians to watch her funeral at Westminster Abbey.
In a citywide tribute, the Shrine of Remembrance, Flinders Street Station, MCG and other Melbourne landmarks will light up in regal purple from Friday night until her funeral.
The premier recalled meeting the Queen when she officially reopened Melbourne's Royal Children's Hospital in 2011 during one of her 11 visits to Victoria.
"Both Cath and I were struck by her absolute work ethic and the very nurturing way that she engaged with all the people that she was meeting," Mr Andrews said.
Federal, NSW and Queensland won't sit next week as initially planned, while SA's legislature suspended a sitting that was scheduled for Friday.
The West Australian parliament has suspended next week's planned sittings but will sit briefly on Tuesday to hear a condolence motion before adjourning until the following week.