Australians Myuran Sukumaran and Andrew Chan have lost their appeal in Indonesia to challenge the decision to deny them clemency.

The unusual appeal in the state administrative court was seen as the pair's last legal avenue to save them from the firing squad for the 2005 heroin smuggling bid.

They were sentenced to die in 2006 over the Bali Nine heroin smuggling bid.

A panel of three judges handed down their decision for Chan on Monday, upholding their earlier decision that presidential clemency can't be considered a state administrative matter.

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The decision for Sukumaran, expected to be the same, was set to follow.

The same court in February rejected the Bali Nine pair's challenge, determining the decrees by President Joko Widodo were not within its jurisdiction.

It's not known what move the lawyers will take next in their efforts to spare the men, who are awaiting execution on Nusakambangan island, Central Java.

Jakarta is awaiting all of the 10 prisoners in line for the firing squad to run out of options for court appeals before setting a date.

But lawyer Peter Morrisey, who's part of their legal team, said there are other avenues they can look at to try to spare the men's lives, Newstalk ZB reported earlier today.