The Greens' First Nations advisory group has said national Treaty negotiations are a key condition to their support for a Voice to Parliament.
The party has not yet officially backed the Voice referendum which could be held as early as August this year, and have long held the position that Treaty and truth-telling must be part of the process.
Tjanara Goreng Goreng, a national co-convenor of the Greens' First Nations Network, which informs the party's policy on Indigenous matters, called on the federal government to include discussion of Indigenous sovereignty in the Voice referendum.
"My view is the voice, as recognised in the constitution, will not provide what First Nations people have been asking for for a long time," she told Guardian Australia.
"We've always fought for our rights: human rights and rights to land. Our rights to land and country are about the recognition of prior sovereignty. Truth, treaty and voice as we've laid it out might be more difficult to do, but it's more transformative for our country."
Last week Gunditjmara, Gunnai and Djab Wurrung senator Lidia Thorpe said the Australian government needs to implement significant reforms on Indigenous child protection and deaths in custody to secure her full support for the Voice to Parliament.
Senator Thorpe, the Australian Greens spokesperson on Indigenous policy and senator for Victoria, said the federal government must implement the remaining recommendations from the 1991 Royal Commission into Aboriginal Deaths in Custody and the 1997 Bringing them Home report on Indigenous child removals.
Senator Thorpe said her position on the Voice was guided by the Greens' First Nations group, convened by Ms Goreng Goreng, a Wakka Wakka woman, and Dominic Wy Kanak, a Torres Strait Islander man.
Acting Greens leader Larissa Waters said the party wants to see "progress on all elements" of the Uluru Statement during its negotiations with the government.
"Our negotiations with the government are aimed at encouraging ambitious plans for truth and treaty, and once we have more clarity on these, our party room will be able to discuss and take a formal position," she told Guardian Australia.
