The actor, who played Jessica's killer in the partly-fictionalised retelling of the 1999 incident, has won praise for his performance as Manish Bhardwaj.
Ayyub told Digital Spy: "Although Vidya and I made it a point not to talk too much during the filming, at the screening and premiere, Vidya came to me three times to congratulate me. Rani also said I did a good job."
In its review of the film, The Times of India wrote that the theatre-trained actor "portrays his character with conviction", and critic Taran Adarsh described Ayyub as "very good".
"It is one of those rare movies that is being appreciated both at a critical and commercial level," said the debut star.
Raj Kumar Gupta's second directorial venture after Aamir is on general release now.