"Actors are very selfish. While shooting for a film, they care about only their part. But it is the director who manages everything. Since he heads the team, he has to be smart enough to handle things, " Nawazuddin told.
He also feels that a director is like a captain of a ship and if he is intelligent he can propell a film in the right direction.
"Film is a director's medium and director is the main and the most important point. It is the director who can make or break the entire story.
"If a story is good, and the director is not, then he will ruin everything. But if he is good, he can do wonders to an even okay kind of a script, " said the 38-year-old, an alumni of National School of Drama (NSD).
The actor has become a name to reckon with after his powerful performances in small roles in "Kahaani", "Paan Singh Tomar" and then he made it big with "Gangs of Wasseypur", a two-part crime thriller that wowed the audiences at the recently concluded 65th Cannes International Film Festival.
He thinks a big star cast is no more important to make a movie successful.
"Nowadays, every actor has an influential role in a movie, be it small or big. And films these days don't essentially need a big star cast to cash in profits."
"...I think the audiences have got bored of the repeated performances of the stars that is why new actors' performances are appreciated, " he added.
Nawazuddin won the best actor award at the 12th annual New York Indian Film Festival (NYIFF) for his performance in Mangesh Hadawale's "Dekh Indian Circus".
His "Gangs of Wasseypur" is expected to release here June 22 and the actor will also be seen in movies like "Chittagong", "Talaash", "Patang" and "Lunch Box".