Starring Nawazuddin in the titular role, the biopic penned by Shiv Sena leader Sanjay Raut, will be directed by Abhijit Panse.
Speaking at the launch of a teaser of the film on Thackeray, Nawazuddin said, "It's an important day for me today as the teaser of the film is launched. I have got the opportunity to play the role of a great person like him, I think any actor would have agreed to play his role."
The teaser was launched here by superstar Amitabh Bachchan.
"I am thankful and grateful to Sanjay Raut, Uddhav Thackeray, Abhijit for the film and Bachchan sir for launching the teaser. I am sure Abhijit and we would take this biopic up to the mark," Nawazuddin, who is shooting in Mauritius, said via video conference.
"Everyone would be thinking, how can I speak Marathi, let me tell you, Bal Thackeray sahab would be giving me inspiration and would be showering his blessings (on me) to play the part," he said, in Marathi.
Bachchan said he was grateful for being invited for the teaser launch. He said a three-hour film will be too short to bring Thackeray's illustrious life on-screen.
"I don't think Balasaheb's life can be shown in three hours. I wish there is a series made on him of three-four hours, for his personality, work, life is much beyond a film. I feel it should be shown in a web series of many episodes. I congratulate and wish Sanjay Raut the best for this film.
"If I am required for the film I would love to be part of it in any capacity. I will always be ready to contribute to this film, in every way possible," Bachchan said.
Bachchan said he looked at Thackeray as a father figure.
"We were very close to each other, we were more like family. I respect him a lot," he said.
The biopic will release on January 23, 2019.