Nawazuddin Siddiqui will be seen as a boxer for the first time in his career in Sujoy Ghosh's next. The film, which is based on the book The Devotion Of Suspect X, also stars Saif Ali Khan and Kangana Ranaut. The versatile actor is slated to undergo physical training for about two months to gear up for the role. Our source revealed, “He doesn't have to get beefy for the part but needs to look fit and lean.“ The makers will assign a trainer who will look after the actor's fitness and diet for these two months.“ The film is slated to go on floors in June. Saif too will play a boxer in the film.