The film, which is currently being shot, will see Ranbir Kapoor play Sanjay. It also stars Dia Mirza as his wife Manyata.
Hirani and Sanjay have collaborated in two Munnabhai film series and "PK".
"I always felt that if ever a film is made on Sanjay Dutt there's no one other than Raju Hirani. I know it is on safe hands," Priya told PTI.
"I was not very much involved in the scripting process as the film is about Sanjay. But whenever the director would need any help, I would gladly give him the required details," she says.
Launching on World Cancer Day, 4th of February, customers will be able to pledge their hair for donation at a Lakme Salon in Mumbai.
"As a small step in our hectic lives, this is a chance to contribute to a relevant cause," Priya says.
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