Both the actors have given their nod for debutante director Nitya Mehra's untitled love story.
"There are different age groups that we have to play in the film. I have to age as the character grows. I am playing a character who grows from the age of 28 to 46 to 60. And to play these parts is tougher for me. I am excited to try prosthetics look," Sidharth told PTI in an interview here.
There were reports that the untitled film is a time travel movie, which Sidharth denied.
"It is not a period film.. It's not time travel. It is a journey of this couple, a love story that spans across different age groups," he added.
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There will be changes in the look of both Sidharth and Katrina and he is okay with it.
The "Ek Tha Villian" actor said the international prosthetics make-up team has great technology of putting silicon mask, changing eye colour, hair.
On being asked if he feels a sense of nervousness to work with established stars like Akshay Kumar, Katrina, he said, "There is no nervousness in working with established stars as such. The film (Nitya Mehra's film) is way tougher because I have to play different age groups," he said.