The film is based on Singh, who assassinated Michael O'Dwyer, the former Lieutenant Governor of the Punjab in British India in 1940, to avenge the 1919 massacre of Jallianwala Bagh.
"I am making the Udham Singh biopic, I'm already in the process of it, I've started shooting few clips also. The cast has been more or less locked, I'll be letting it out soon," Shoojit told PTI.
Shoojit says he has had cinema-related discussions Ranbir, but not specifically about this film.
"... But Ranbir isn't there. We are friends, we played football together so we have meetings together. We talk about cinema and other things, but no. If something happens with Ranbir in the future, I'll let you know," he adds.
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Starring Varun Dhawan, "October" will be Sircar's sixth directorial venture since his 2005 debut "Yahaan".
Over the years, while he has established himself as one of the top filmmakers, Sircar says his writing process remains unchanged.
The director attended a panel discussion at the FICCI Frames here about 'Chinese Dragon Market for Elephantine Indian Films'.
With "Dangal", "Secret Superstar" and now "Bajrangi Bhaijaan" doing mammoth business in China, Shoojit says the business a Hindi film does there is "shocking".
"When you compare the kind of cost of recovery here from there, it really shocks you. It's like buying a lottery ticket in the morning and hitting a jackpot in the night. The biggest revelation was the number of theatres they have," he says.
"In the last few years, whatever has happened with censorship and people taking law in their own hands, obviously that's not right. Nobody is backing that at all. There is a Constitution, the Supreme Court, the government has already set up a body, which is the CBFC, and we should abide by the rules," Shoojit says.
Asked if it worries him, the director says, "The kind of situation like this did scare me when people didn't let 'Madras Cafe' release in Tamil Nadu.
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