Gaffar Nadiadwala approached Sanjay Khan for the film . He told Sanjay he wanted to take Pran in the role of his brother and he was about to sign him. Sanjay Khan told Nadiadwala that Pran was too old to play his brother and looked more like his father. Sanjay suggested they sign a actor who resembled him. That is when Sanjay recommended they sign Feroz Khan for the film. When Nadiadwala heard this he asked Sanjay that if he were to sign Feroz, would Sanjay work for free in the film. Sanjay said no he wanted his market price. Thats when Gaffar signed Feroz and Sanjay both for the film.
Amitabh was considered for Sanjay's role but the distributors were against it.