Actor-producer Vishal says the prime reason he agreed to be a part of forthcoming Tamil comedy "Kaththi Sandai" was the inclusion of veteran comedian Vadivelu in a comeback role.Directed by Suraaj and co-starring Tamannaah Bhatia, "Kaththi Sandai" is slated for a November 18 release."When Suraaj approached me with the offer, I told him if he can convince Vadivelu and bring him on board, I will do this film. I signed the project only when I was told Vadivelu had agreed to be part of the film," Vishal said at the film's audio launch.Vishal had earlier worked with Vadivelu over a decade ago in Tamil film "Thimiru"."Our combination resulted in a hit in 'Thimiru'. Earlier this year, when we worked together in the Nadigar Sangam elections and our collaboration once again clicked. I expect it to work again in 'Kaththi Sandai'," he said.Talking about "Kaththi Sandai", Vishal said it's a quintessential Suraaj kind of entertainer."We enjoyed working on the film.Audiences will love to see Vadivelu on screen and he has aced his role," he said.