The Suva High Court will hear a motion this afternoon on whether 56 convicted army mutineers should be freed.
Radio Fiji reports that their lawyer, Kitione Vuetaki, has filed a writ claiming that the mutineers were unlawfully confined at Korovou Prison in Suva without a committal warrant.
The respondents in the case are the Attorney General, the Minister for Home Affairs, the military commander and the commissioner of prisons.
A media report earlier said the military had sent the committal warrants after the soldiers court martial in March to the Ministry of Home Affairs which sent it to the President's office.
The President has the powers to confirm the sentences, or reduce or increase them, but this has not been done.
Mr Vuetaki claims his clients are unlawfully detained because no committal warrants were issued.
The soldiers were sentenced to terms ranging from life to three years for their role in the mutiny at the Labasa barracks during the coup.
