Members of the Victorian Coalition have been given the opportunity to openly support or oppose the Indigenous Voice to parliament.

It comes after the Victorian shadow cabinet agreed to give the state's opposition MPs a free vote on the Voice.

At a shadow cabinet meeting held on Monday state frontbench MPs voted unanimously to not force Victorian Liberal and National MPs to vote along party lines, which are yet to be determined.

The position is in direct contrast to federal Liberal leader Peter Dutton, with members of the federal opposition's frontbench bound by the party's official 'no' stance, a decision which lead to Julian Leeser quitting the federal frontbench to campaign for the Voice and to former Minister for Indigenous Australians Key Wyatt's resignation from the Liberal Party entirely.

The granting of the free vote is expected to be formalised this week, with Victorian Liberal leader John Pesutto and Nationals leader Peter Walsh expected to put the decision to their respective federal party rooms for final approval.

Although federal Opposition Leader Peter Dutton and Nationals Leader David Littleproud have both made their opposition to the current Voice proposal official, neither Mr Pesutto nor Mr Walsh have confirmed their individual perspective on a constitutionally enshrined Voice.

Last month Mr Pesutto said he was keeping an "open mind" on the Voice.

"I don't really want to comment on what the federal Liberals are doing. My responsibility as the Victorian Liberal leader is to make sure that the course we're adopting is inclusive," he said.

Set to be delivered to federal parliament by mid-May, Mr Pesutto is expected to wait until the release of the parliamentary report on the Voice, with both parties set to formalise their Voice stance by the end of the month.

The Voice referendum is scheduled to be held on a Saturday sometime between October and December.