Set in the 1980s-90s, the film revolves around all that went into transforming Bombay into Mumbai.
"The studio is taking full precautions and sanitising the place regularly. But one careless move can be fatal."
Akshay Kumar plays the title role of Deputy Commissioner of Police, Veer Sooryavanshi, who heads the Anti-Terrorism Squad in the film.
The actor is happy with the portrayal of negative characters on screen.
Gulshan, who has worked in over 400 films since 1980 and essayed various villainous characters, says heroes essaying negative roles "is a very good sign".
The grand premiere of the biopic was organised on Wednesday evening with a galaxy of Bollywood stars and the entire Indian cricket team attending the event, besides Tendulkar's close friends and family members.
"Ravana's character is the most difficult and challenging. Till now many actors have portrayed this character but in a certain way," Gulshan Grover said.