Film Director Rajkumar Hirani revealed in an interview why Aamir khan Aamir Khan did not play Sunil Dutt. Rajkumar Hirani said, Aamir is a friend. Any script I write, I bounce it to him. When I narrated ­Sanju to him, he loved it and said, 'Main bhi kuch karta hoon, But he was already doing the role of an elderly man in Dangal around the same time,thats why he did not play Sunil Dutt roll.