The "Shuddh Desi Romance" actor in order to get into the skin of the cricketer, had to undergo rigorous training to perfect his cricketing skills, specially to pull off Dhoni's trademark 'helicopter' shot well on screen.
"He (Sushant) has worked very hard. He was practicing everyday for more than nine months. He was batting everyday for over three hours when it comes to portraying the (cricket) shots," Dhoni said in a statement here.
"Also the way I walk, the way I talk, he has copied almost everything. In fact I was amazed to see him do all these things," he adds.
Also starring Kiara Advani and Anupam Kher the film is scheduled for September 30 release.