A report on the health of Sir Michael Somare will be handed to Papua New Guinea's governor-general today before a decision is made on whether the veteran prime minister should formally resign.
Sir Michael has been recovering in hospital in Singapore since undergoing heart surgery in mid-April.
Acting prime minister Sam Abal is expected to hand the report, prepared by Sir Michael's physician Professor Sir Isi Kevau, to Governor-General Sir Michael Ogio this afternoon.
Local media say that after studying the report, the governor-general will advise parliament whether it's necessary to appoint a new prime minister.
Parliament is scheduled to resume sitting tomorrow.
In June, Sir Michael's son Arthur Somare publicly announced that the family was retiring him, but there've been reports some of the family didn't back this move, while constitutional experts pointed out it's a decision for parliament.