"Kabir has been signed on to play the antagonist. He will join the sets in June and shoot non-stop to complete his portions," said a source from the film's unit.
To be directed by Siva, the film features Shruti Haasan as Ajith's heroine.
Lakshmi Menon is most likely to play Ajith's sister, while the rest of the cast is yet to be finalised.
The film is set to go on floors in May.
Last seen in Telugu actioner Jil; Kabir has signed the yet-untitled Telugu remakes of Tamil hits Sundarapandian and Maan Karate. He will be playing the baddie in both the films.