A lawyer for Andrew Chan and Myuran Sukumaran admits they don't have "much chance" of succeeding with a challenge to the presidential decree denying the two Australians clemency.
But Todong Mulya Lubis says: "I hate not to try".
"I hate not to do it, because when we talk about human life, we have to do everything possible," he told ABC Radio.
On Tuesday, the pair's lawyers will mount a rare challenge to President Joko Widodo's decision to deny them clemency.
In Indonesia's State Administrative Court they will argue Mr Widodo made the decision without considering Chan and Sukumaran's rehabilitation in prison.
"The president does not break the law, but the sense of justice has been broken," Mr Lubis said.
"There must be due diligence, there must be governance, there must be compliance with the best practices."
Authorities say it's "very likely" the Bali Nine duo will this week be relocated to the island where Indonesia plans to execute them.
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