Kollywood actor Silambarasan has been roped in by Mani Ratnam for his forth coming flick after Raavan. The actor will also be dubbing for Abhishekh Bachan for the bilingual flick 'Raavan'. “Since Mani found Silambarasan’s voice apt for Abhishek, he requested the actor to dub for the Junior Bachchan, for which the latter responded positively,” said sources close to the actor. Simbu has dubbed for numerous other films as well. For instance, he dubbed for the tamil version of slum dog millionaire protaganist Dev Patel. Simbu is currently busy at the sets of 'Vaaliban' which is his dream project for a long while.