"Mr Bachchan came when we had developed more than half the idea of 'Pink'. We were not sure if he would do it (film) or not. We took a chance as we thought he has a certain trust factor as we worked together in "Piku"," Shoojit told PTI.
"He trusted us blindly. He agreed to do the film as I was there on board as a producer for 'Pink'. We are answerable to him and our audience, so we make sure what we are making is a great film," he said.
"In all the three films that I have done with him, I have given him different and challenging roles. In both the films 'Shoebite' and 'Piku', he (Bachchan) felt he was challenged as an actor. We had to challenge him as an actor for the role in 'Pink'," Shoojit said.
In the Aniruddha Roy Chowdhury-directed film "Pink", Bachchan plays the role of a lawyer. Without killing the element of suspense over the role of "Paa" actor, Shoojit said
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His (Bachchan) part in the film is doubtful and beyond this he cannot reveal any details.
"When he came on board it was an added responsibility for us as we couldn't have gone wrong as he had trust in us. This is not a gimmick kind of a film. Also, as the subject is serious we had added responsibility," he said.
According to Shoojit, the preparation for the film was tough for Bachchan.
"He (Bachchan) did a lot of hard work, he did lot of rehearsals, read lot of research material and editorial articles. He used to often ask us lot of questions, he used to ask why this or that," he said.
"He is same as I had met him for the first time. He is young at heart. He is like a 17-year-old college boy who wants to do lot of things and he gets excited to do new things," he said.
"After working for over 40 years he gets excited and is enthusiastic when he gets to do a brilliant scene. He jumps over it. This I haven't seen in many actors," he said.
"I haven't seen such a disciplined actor, it's rare to find to find someone like him. He respects everyone," he said.
Also starring Taapsee Pannu, Angad Bedi and others, "Pink" releases on September 16.
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