The investigative thriller, titled "The Tashkent Files", will star veteran actors Naseeruddin Shah and Mithun Chakraborty in pivotal roles.
However, the director is yet to cast the actor who will play the role of Shastri in the film.
Asked about the roles of Chakraborty and Shah in the film, Agnihotri told PTI, "They are playing two power centres. Two points of views."
Yesterday, the director had tweeted, "On this day, 10th Jan 1966, in Tashkent a tiny man called Lal Bahadur Shashtri, who won a war with Pakistan, soon after a humiliating defeat with China, signed the Tashkent treaty.