Lawyers for Bali Nine death row inmates Andrew Chan and Myuran Sukumaran have been given until today to produce a so-called expert witness as part of the pair's latest legal challenge.
The two men are challenging Indonesian president Joko Widodo's refusal to consider granting them clemency.
The witness was due to present evidence as part of the bid last week, but failed to appear in court.
Chan and Sukumaran's lawyers have until today to call the witness before the court.
The president's lawyers will then get a chance to defend him.
The Australians have been on death row for 10 years after being convicted for their role in a plot to smuggle heroin into Australia.
The men were originally due to face the firing squad last month but the Indonesian government put that on hold until the legal challenges of all those listed in the next round of executions were complete.
They were transferred to the Nusakambangan island prison off Central Java from their Bali prison in early March in preparation for their executions.