Former treasurer Joe Hockey will be named Australia's ambassador to the United States on Tuesday.
Mr Hockey retired from parliament in September and a by-election was held in his seat of North Sydney at the weekend.
AAP understands the appointment will be announced via a media statement on Tuesday.
Prime Minister Malcolm Turnbull told the ABC's 730 program on Monday he would not comment on the appointment.
"Joe is a great Australian and I look forward to him serving Australia in other capacities," Mr Turnbull said.
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"Any announcements will be made in a more formal and appropriate manner."
The current ambassador, former Labor leader Kim Beazley, starts a new role with the Australian Institute of International Affairs in January.
