The Victorian coalition initially reserved its support for the Treaty Authority and Other Treaty Elements Bill 2022 after the Andrews government introduced the legislation in state parliament a fortnight ago.

But Opposition Leader Matthew Guy confirmed the Liberals and Nationals would vote for the bill without amendment after a joint partyroom meeting on Tuesday morning.

"We'll be supporting the legislation when it comes to parliament tomorrow," he told reporters.

"Reconciliation is a topic that should be around uniting Australians ... that's why this is an important step to acknowledge that."

The Victorian coalition announced in May it would work with traditional owners to "advance the treaty process" after Mr Guy voiced preference for federal-run treaty talks before the 2018 state election.

However, senior Victorian Liberals including shadow treasurer David Davis and outspoken backbencher Tim Smith have since expressed concerns about the treaty legislation.

Mr Smith, who will not recontest his seat in November after a drink-driving crash, branded the bill "divisive tokenism" and flagged his intention to vote against it.

"It's something in good conscience I can't support ... and as a consequence I will be crossing the floor," he said.

Shadow Aboriginal affairs minister Peter Walsh would not say if Mr Smith or others spoke out against the bill in the partyroom.

The coalition intends to work with the Indigenous communities to make sure their aspirations are achieved, including on Closing the Gap indicators, Mr Walsh said.

"The federal government and all the states have failed in actually meeting benchmarks and closing the gap around Indigenous health, around Indigenous education, around housing in our communities, around employment opportunities," he said.

If the legislation passes, as expected, the treaty authority will have legal powers to oversee negotiations and resolve any disputes between the state government and the First Peoples' Assembly of Victoria.

It will be led by Indigenous and Torres Strait Islander people elected by an independent panel and be grounded in culture, lore and law.

Premier Daniel Andrews urged every member of parliament to "get on board" with the state's truth, justice and treaty agenda.

"Ultimately, the best outcomes for Aboriginal people come when they are led by Aboriginal people," he said.

"The First People's Assembly ... has been very clear on what the path forward is and it's not for us, might I say, to be critical of that."

Aunty Geraldine Atkinson, co-chair of the First Peoples' Assembly of Victoria, said treaty will drive fundamental outcomes for the community by putting Aboriginal people in the driver's seat.

"This is the right side of history," the Bangerang and Wiradjuri elder said.

Australian Associated Press