The film, which just began principal photography last week in Toronto, centres on ruthless corporate headhunter Dane Jensen (Butler), who works at Blackridge Recruiting arranging jobs for engineers.
He is on his way to achieving his longtime work goal of taking over the company, when his ten-year-old son falls ill and his personal and professional priorities clash.
Kher, 60, has earlier worked in international films like "Bend It Like Beckham" (2002), "Bride And Prejudice" (2004) and 2012' "Silver Linings Playbook".
The actor, who flew into freezing temperature of Toronto Monday, is excited about the script and his role in the film.
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"Anytime I shoot for a foreign film I always keep in mind to represent my country. That helps me in performing my best."
"The Headhunter's Calling" is written by Bill Dubuque, who has earlier penned the Oscar-nominated movie, "The Judge" and "The Accountant".
Williams and Butler will produce along with Alan Siegel. Dubuque and Danielle Robinson will serve as executive producers, along with Dan Bekerman of Scythia Films. No release date has been set yet.
Kher's upcoming Bollywood projects include Indian cricketer Mahendra Singh Dhoni's biopic, directed by Neeraj Pandey.