The lawyers, led by human rights advocate Todung Mulya Lubis, told the judicial committee that all six judges who brought down the death sentence had breached ethics.

The new claim follows the shock intervention of the Bali nine's former legal counsel, Muhammad Rifan, last weekend, who said there had been an "intervention" that could discredit him but provided no details.

In an extraordinary statement after visiting the men inside Kerobokan prison, Mr Rifan said he was prepared to "take the heat" and provide the "never revealed evidence" to Andrew Chan and Myuran Sukumaran's current lawyer, Mr Mulya.

"It's something that implicates us, it could discredit me. But for them I will take it. I told Myuran it's okay," Mr Rifan said cryptically. "It's one last thing I can do for them."

Following his dramatic, if imprecise, comments, Mr Rifan left Indonesia to travel to Mecca for a religious pilgrimage.