Filmmaker Karan Johar says he is honoured and excited to have southern superstar Nagarjuna play a special role in his upcoming production venture Brahmastra.

Karan on Monday took to Twitter and wrote: "We are honoured and exceptionally excited to have the one and only Nagarjuna doing an extremely 'special' role in our film 'Brahmastra'! Directed by Ayan Mukerji, (starring) Amitabh Bachchan, Alia Bhatt and Ranbir Kapoor... Thank you Sir for your love and your beautiful energy."