A source close to the production tells us that Ranbir had recommended the actress for his own film, Window Seat. But apparently Imtiaz found Alia "too young" for the role.
Imtiaz confirms this and says, "Ranbir has always believed that Alia has a lot of potential as an actor. So he had suggested her name, and asked if she fits the role. But she is too young for the part."
It's interesting to note that Imtiaz, instead, cast Alia in Highway, for which he'd initially wanted an older actress.
After the film released, Ranbir was apparently so impressed with Alia's work that he called to congratulate her. On her part, the actress too has always been open about her admiration for Ranbir. During the promotions of her debut film, Student of the Year (2012), she had said that "I have always loved Ranbir... He is my biggest crush and he will always remain my biggest crush."
Ranbir's film with Imtiaz, which goes on floors later this year, will have Deepika Padukone as the lead actress.