The film, which is scheduled to release this Diwali, stars Ranbir Kapoor, Aishwarya Rai Bachchan and Anushka Sharma in lead roles.
Fawad, who made his Bollywood debut with the 2014 film 'Khoobsurat', plays a DJ in the film and says he will be seen in a completely new avatar.
"It's not exactly a cameo but it becomes a backbone for a certain conflict of a character in the movie. It's like 15-20 days of work. My role is that of a DJ. So it's cool. I have tried something new altogether, I am wearing a completely new costume. I wouldn't mind playing a cool guy character or a complete buffoon as well," Fawad told PTI.
The 34-year-old actor said he is currently experimenting with his work and his role in 'Ae Dil Hai Mushkil' will be different from Rahul Kapoor, his character in the upcoming 'Kapoor & Sons'.
"Right now I am experimenting (with) these things. I am loving the stuff I've done in the film, the walk, the talk, the way you carry yourself. It's competent different from what Rahul Kapoor is."
'Kapoor & Sons' also stars Alia Bhatt, Sidharth Malhotra, Rishi Kapoor and Ratna Pathak Shah. The film, directed by Shakun Batra, revolves around two estranged brothers who are forced to return to their childhood home when their 90-year-old grandfather wants to see them. It hit theatres on March 18.