Aamir, who plays the roleof a 24-year-old engineering student in the movie alongside R Madhavan and Sharman Joshi, went on to collaborate with Hirani again in "PK".
The movie was a huge hit at the box office and there has been some buzz about a sequel for some time.
"Raju Hirani has given me a hint about '3 Idiots' sequel and I am giving you all a hint. The film will happen if and whenever he will write the script. Let's keep our fingers crossed," Aamir told reporters at the special screening of Hirani's latest production "Saala Khadoos" where Madhvan is in the lead role.
Aamir said films on sports can act as a great source of motivation for youth.
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"Sports film inspire young people and it is also exciting to watch such film and more of it should be made."
The superstar, who is known for undergoing complete physical transformation for his roles, will be shedding 25 kilos for the June schedule of the biographical drama after piling on pounds for the same movie.
"I will have to lose 25 kilos to play the younger version of my character. We will begin shooting for that portion in June and I have already started working out on that. It is tough to lose and gain weight. We face many problems, but an actor's body is his instrument and he has to mould it as per the demand of the role," he said.
He had tweeted that he would be happy to work with the actress contrary to what the interviewer suggested.
When asked about it today, Aamir said, I am willing to work with Sunny and will do something for sure as soon as the right script comes.