It is known that Karthi has come on board for Mani Ratnam's upcoming movie to play the lead role.As the latest buzz, The film isn't a solo-hero subject but a multi-starrer. If the sources are to be believed, Dulquer Salmaan (Ok Bangaram fame) and Shruti Haasan were approached to be part of the project.Mani Ratnam is all praise for Dulquer Salmaan's acting skills and he even commented the lover boy is much better actor than his father Mammootty. On the other hand, Shruti Haasan was supposed to pair opposite Mahesh Babu in Mani's multi-starrer which got shelved. Finally, Everything has been falling in place now.Reportedly, Mani Ratnam himself would produce this multi-starrer on his Madras Talies banner. The project is likely to go on floors in September 2015.