Oberoi will play the main antagonist in the film, which also stars Ajith Kumar, Kajal Aggarwal and Akshara Haasan.
"Vivek Oberoi is a powerful actor. When I conceived this character, I wanted an intense actor to essay the role. From the production side, they suggested Vivek Oberoi since he has an international look, knows Tamil and he likes Ajith sir a lot," Siva told PTI.
The director said Oberoi's faith in the script made him feel truly confident about the movie.
"Vivegam" marks director Siva's third consecutive collaboration with Ajith after two successful box-office hits such as "Veeram" and "Vedalam."
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The director said he was initially hesitant about pitching the script to Ajith since he had undergone a knee surgery back then and the role demanded a significant physical transformation.
"I narrated him the script and after listening to it, he assured that he will be ready soon. He exerted himself against his doctor's advice, working out two hours in the morning and two hours in the evening. He did what he promised."
"It was very challenging to perform and shoot a motorcycle chase during the night and that too in such extreme weather conditions."
Siva said Kajal, who has been paired with Ajith for the first time and plays his wife in the film, is a fantastic actor.
"When I narrated the story to Kajal, she said, 'I have done 47 films so far, but never done such a role'. I was extremely happy about what she told. Her character is an NRI but a very subtle, homely and pious woman."
Talking about the composer, Siva said, "Anirudh is like a fully charged battery... He is a rock star, a true wizard. He can churn out a folk song like 'Aaluma Doluma,' and a Western like 'Surviva' that sets the bar high."
Produced by Sathya Jyothi Films, "Vivegam" is slated to release on August 24.
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