Johnny Adair will seek a judicial review to overturn his imprisonment, it was confirmed last night.
Lawyers for Adair, who lost an appeal to the Sentence Review Commission last month, will argue that the decision to keep him in prison contravenes European human rights legislation.
Adair (37), from the loyalist Shankill Road area of west Belfast, was returned to jail in August at the height of the feud between the Ulster Freedom Fighters and the Ulster Volunteer Force.