The 30-year-old actor, who essays the role of the cricket star in "MS Dhoni : The Untold Story," said Dhoni's life story is about believing in your dream.
"We are punctuating the belief Dhoni had in himself. There was not even an iota of doubt that if this thing doesn't happen, then there is a plan B. One should not dream or work to achieve something to get a high status in society.
The actor said through the film they are not glorifying the Indian cricketer and have shown all the important instances of his life exactly the way they happened.
"We are not trying to glorify Dhoni. We are not over-glamourising anything. Right from his birth to the 2011 World cup six that he hit, we are showing everything."
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"Dhoni never taught me his cricketing style or his mannerism. There were only three instances when I met him. The first time I met him I was just talking to him about how he feels about his own story. Then I met him to ask 250 hypothetical questions about how he would react to some situations.
"It was just to understand him better and the third time I spoke about the instances mentioned in the script."
"I trained with Kiran More sir for 13 months and he is a tough task master, he treats you like a professional cricketer and not an actor."
Sushant said the only similarity between him and Dhoni is that both of them don't think too much about the future and keep working hard for their dreams.
"I stay in the present, I don't really plan things. For me the journey is very important and not the achievement."
The biopic is directed by Neeraj Pandey and Sushant said the filmmaker locked him for the part in just 20 minutes.
"As an actor the most important thing I did to become Mahendra Singh Dhoni was to convince myself that I am the character. For last 12 years I have been a big fan of Dhoni and that was tricky so the bottom line was complete immersion.
"I used to watch his videos for hours and hours and subconsciously adapt few of his nuances."
"MS Dhoni: The Untold Story will hit the theatres on September 30. The film also stars Anupam Kher, Kiara Advani and Disha Patani.