Siddharth is gearing up to play the lead role in a film by director Roger Spottiswoode, who had made the James Bond film 'Tomorrow Never Dies'. In the movie, the actor will be playing math genius Srinivasa Ramanujam, who rewrote the history of numbers.

"Roger was thoroughly impressed by Siddharth's performance in Rang De Basanti, which was recommended to him by one of his friends. He immediately decided that the actor should play Srinivasa Ramanujam in his next movie," say sources close to the development.

"Siddharth was thrilled to get a call from Roger and he went to England to listen the script, which impressed him. The actor immediately expressed his consent to be part of the movie, which he hopes would take him to international audience," they add.

The south Indian actor, who is popular in Bollywood too, is currently part of Deepa Mehta's film adaptation of Salman Rushdie's Booker winner Midnight's Children. In Kollywood, post 'Nootrenbadhu', he is at present acting in a romantic-comedy titled 'Kadhalil Sodhappuvadhu Eppadi', directed by newcomer Balaji.