Davis, in the country for the premiere in Mumbai, hopes that people in India embrace the film. It releases in India on February 24. He is also keeping his "fingers crossed" for the Oscars where the film is nominated in six categories, including the best picture.
"It is a beautiful story and something that deserved to be told. I am very proud that it has been loved by so many. I hope India embraces it too. I have a deep affection for India mainly because of its people. They touch you in ways you don't really forget," Davis told PTI in an interview over phone from Mumbai.
He survives many challenges before being adopted by an Australian family. Years later he tracks down his lost family in India via Google map.
The Australian director, best known for his TV series called "Top of the Lake", says he knew it was a "huge responsibility" the moment he read Saroo's story.
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"I retraced the steps that young Saroo had taken as he was lost on the train station. I remember when I found myself on the Kolkata station and imagined my five-year-old child there, unable to speak the language, invisible to everyone, standing there alone and I felt absolutely mortified."
"The whole story is about the power of hope, belief and determination. We also needed those elements to make this film. I had to trust that I will find the boy and trust that he will do a brilliant job.
"We were very scared and it was sobering to have that kind of trust. We knew that the story could only survive and be as good as it could be if the performance the little boy gives is extraordinary."
Davis believes the film is a turning point for Patel, who is up for an Oscar in the best supporting actor category for his portrayal of grown-up Saroo.
"This film marks a point in Dev's career where he was able to show another side of himself to the world. I knew that he would be perfect for Saroo during the rehearsals as I could sense this hunger in him."
The director, who is teaming up with Mara again for his next project, a biopic on Mary Magdalene, says his only condition for casting the actors was that they had to love the story.
"I had a rule that everybody who was a part of this project had to be passionate about the story. If they did not feel the story in their heart, they were not going to be a part of the film no matter how big they were. Everybody came onboard because they wanted to be. It was a wonderful experience working with people who cared about the film so much.