New laws to create an independent authority to oversee Victoria's treaty negotiations are set to pass with bipartisan support.
The Victorian coalition initially reserved backing the Treaty Authority Bill after the Andrews government introduced it 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."
The Victorian coalition announced its support for treaty negotiations in May after Mr Guy suggested a federal process would "make more sense" before the 2018 state election.
Liberal MP Tim Smith, who will not recontest his seat in November after a drink-driving crash, said he does not support "illiberal and divisive tokenism" and will vote against the legislation.
"I will be crossing the floor," he tweeted.
Shadow Aboriginal affairs minister Peter Walsh would not say if Mr Smith or others spoke out against the bill in the partyroom.
"Tim, as an individual, is entitled to his opinions," he said.
If the legislation passes, as expected, the treaty authority will have legal powers to oversee treaty talks 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.
