New York-born Sethi will be the only actor to appear onscreen in the project which is a combination of live-action and animation, said the Hollywood Reporter.
Jon Favreau is directing the film from a script by Justin Marks for a release in 3D on October 9, 2015.
While Mowgli's jungle family will be created with the help of CGI, the voice cast boasts Idris Elba as the villain Shere Khan, Ben Kingsley will voice beloved panther Bagheera while Scarlett Johansson and Lupita Nyong'o are also in talks for Disney's take on voice parts.