Filmmaker Rakeysh Omprakash Mehra says he is working on several scripts, but his next will the film on iconic Indian athlete Milkha Singh.

Milkha Singh came fourth in the 400 metres at the 1960 Rome Olympics. He also represented India in the 1964 Tokyo Olympics.

"I am writing a few scripts but my immediate next film is 'Bhag Milkha Bhag'. I would start shooting it now. It's on Milkha Singh the athlete, " Mehra told.

Soft-spoken Mehra refrained from divulging any other details, saying, "It's a secret".

Mehra, after directing numerous ad commercials like Coke, Pepsi, Toyota, American Express and BPL, made his directorial debut with megastar Amitabh Bachchan starrer "Aks" in 2001. The film was not a big success, but he rocked the box office with his 2006 release "Rang De Basanti".

His last was 2009 movie "Delhi-6" starring Abhishek Bachchan-Sonam Kapoor.