The International Organisation for Migration says it will not participate in establishing Australia's offshore facilities for processing asylum seekers in Nauru and Papua New Guinea.
The organisation's chief of mission to Australia, Mark Getchell, told The Australian that the government's inability to guarantee that robust protection mandates would be in place means IOM's preconditions for participation have not been met.
The IOM has not ruled out playing a role later.
It ran the asylum seeker centres on Nauru and Papua New Guinea's Manus Island during the Howard government years.
The revived offshore processing system will not have the backing of the UN High Commissioner for Refugees either, as it pulled out last month.