The 74-year-old actor said that Ram Gopal Varma's film is intriguing and unpredictable.
This is what Big B tweeted on Tuesday night:
T 2414 - SARKAR 3 ka pehla din !! First day !! Larger, intriguing and oh so unpredictable !! pic.twitter.com/oe1g9dHrG9? Amitabh Bachchan (@SrBachchan) October 18, 2016
The Pink star also shared that there is "apprehension on the first day of shoot".
"An entirely new environ, an entirely new set up, even if the designs of the story and characters have been indulged well in the past happens all the time. And yet, we never stop speaking about it," he shared on his blog.
Big B, who will reprise his role as Subhash Nagre, also shared new images from the film's sets on his blog:
"The director knows best and we leave it to him and his vision. That is really the best way out," he added.
The cine icon played an integral part in the first two instalments of the film.
Sarkar, which released in 2005, is set up in the world of Indian politics. Its sequel Sarkar Raj hit the screens in 2008.
Sarkar 3 also stars Rohini Hattangadi, Jackie Shroff, Manoj Bajpayee, Ronit Roy, Bharat Dabholkar and Yami Gautam.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)