Mumbai: South star Dhanush of 'Kolaveri Di' fame is keen on casting the star in his directorial debut in Bollywood.

Post the Kolaveri mania, there couldn't have been a better time for South star and Rajnikanth's son-in-law Dhanush to announce his directorial debut in Bollywood. The actor is planning to take the leap into direction with a fantasy flick.

It is learnt that Dhanush is keen on casting Hrithik Roshan as his main lead. Says a source, "A few days back, Dhanush was in Mumbai and he met some people regarding his project.

 He has a few names in mind and Hrithik is on the top of his list. This is a big budget fantasy flick and he needs someone larger-than-life who can carry off the film."

It came as a surprise when Dhanush chose to make this movie in Hindi and not in Tamil. Says Dhanush, "When I say I am directing, I cannot even think of acting in the same space.

 It's my dream project and I want to give it my all. So I'd rather just focus on one thing. Though I think it is too premature to talk about the film, I am definitely finalising the story and looking at some big names to cast."

Dhanush will now regularly travel between Chennai and Mumbai for his forthcoming ventures and also this project, which he is expecting to start by 2012 end.