In an interview to PTI, Deepika Padukone said, "I guess things like chemistry is between characters more than anything else. When we set out to do Love Aaj Kal, we did not plan that we are going to have this chemistry and that people should like us together on screen. It just happened. It is something we did not expect or planned out. Sometimes, some things just fall in place. Everything is just a coincidence."
The Bollywood actress added, "Cocktail is a second romantic-comedy that we are doing together with Illuminati Production. Our chemistry is something that's not tangible. You either have it or don't. For the kind of films that we have acted in, we need to have it. In love stories its very important."
Besides Saif and Deepika, Homi Adajania directed film also stars newbie Diana Penty, Dimple Kapadia and Boman Irani. Deepika said, "Cocktail is about three different characters - Gautam, Veronica and Meera, their background is completely different. How they meet, how they become best friends, living under one roof. And when friendship turns into love, the cocktail of emotions between friendship and love begins."
Deepika was offered both the roles of Meera and Veronica and she opted to play the latter. The actress said, "The role of Meera is similar to the role that I did in Love Aaj Kal and it would have been easy to slip back into doing the same thing. I was ready for a risk and to take on something that is more slightly exciting and challenging. And which is why even Dinesh (producer) was confused, so he offered me both the roles...he knew I could do Meera, but he also felt that I could also pull off Veronica."