Radical cleric Abu Bakar Bashir will soon lodge a bid to be freed from jail, a year after he pledged allegiance to ISIS.
Bashir was acquitted of conspiracy in the 2002 Bali bombings, but is serving 15 years' jail for supporting a terror training camp in Aceh.
The Muslim Defender Team's Mahendradatta confirmed to AAP on Friday that Bashir will seek a judicial review of his case with a Jakarta court within the next two weeks.
"Hopefully next week," he said. "We still need to gather signatures from all the lawyers."
Bashir hopes new evidence will free him.
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Considered the spiritual leader of the group responsible for the Bali bombs, Bashir last year pledged his support to ISIS before members of Jama'ah Anshorut Tauhid (JAT), who visited him in central Java's notorious Nusakambangan prison.
It reportedly alienated some followers, who deserted JAT.
The legal team will argue that Bashir knew of plans to train youths from Islamic organisations at the camp, but thought it was only "marching training" and didn't give the orders.
They claim he wanted 40 million rupiah ($A4000) in funds "be used to purchase ambulance for humanitarian assistance," Indonesian news website Detik.com reports.
The lawyers will bring three previously unheard witnesses to court, two of them leaders of Islamic organisations.
"We hope that the judicial review decision will be more objective in sentencing this case involving our client," the lawyer said, according to the report.
The bombing of two Kuta nightclubs in 2002 killed 202 people, including 88 Australians.
