Produced by Shree Ashtvinayak Cine Visions Ltd, Shah examines underworld in the Pink City and Sanjay will play a 1970s Gujarat-based don.
The yet-to-be-titled film is already being shot in Jaipur and a grand set has been erected - it has a massive mine with tunnels, chimneys and trains to give it a look of 1970s era and to make sure it is in sync with Sanjay's role.
"I wouldn't have made this film if Sanjay wouldn't have done it as only someone like him can carry this kind of character!" Shah said.
Its shooting is expected to finish in 50 days, while its songs will be shot in the country's entertainment capital Mumbai.