Actress Rakul Preet Singh is said to have been approached to play the leading role in filmmaker Mysskin's Tamil thriller "Thupparivaalan", which stars Vishal Krishna."Rakul has been approached. However, she is not yet finalised. It's going to take a few more weeks before the makers will finalise on the heroine," a source from the film's unit told IANS.Tipped to be an investigative thriller, the film marks the first time collaboration of Mysskin and Vishal.Rakul, whose last Tamil film was 2014 romantic-drama "Yennamo Yedho", has been extremely busy in Telugu these last couple of years.She currently awaits the release of Telugu actioner "Sarrainodu".