Ranbir Kapoor has played Dutt's role in the film, that chronicles his life from his young years to his life after jail.
"For 'Sanju', I was thinking why is somebody else playing this bit? The last 8-10 years. you cannot do justice to that. Sanju should have played the last bit," Salman said in a group interview here.
"I have seen the trailer. Raju Hirani is a very sensible filmmaker so he has made a film," he added.
Asked if he is fine with a biopic on his life, Salman said,"No."
When prodded further about an autobiography, Salman said, "No. I anyway say things openly... But I don't want to do it."
Salman, 52, is looking forward to his Eid release "Race 3" on June 15.
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