The actor has previously worked with the director in "Kaho Naa.. Pyaar Hai" (2000) where he played Hrithik's side-kick.
"I have a small but significant role in 'Krrish 3'. I want to give my best shot as it is work at the end of the day. Rakesh Roshan saw my performance in a play titled 'All The Best' and opened the door of films for me. He is a wonderful human being and I am grateful to him," Vrajesh told PTI Bhasha.
'Krrish 3' is the third film of the Krrish film series - the other two being "Koi... Mil Gaya" and "Krrish".
The film also stars Priyanka Chopra, Kangna Ranaut and Vivek Oberoi.
Vrajesh will also be seen in upcoming films like Akshay Kumar-Sonakshi Sinha starrer "Joker" and Irrfan Khan-starrer "Pranam Walekum".
The actor has also signed a project, which is a hindi remake of a southern film, starring Sanjay Dutt and "Singham" villain Prakash Raj.