"The performance that he (Girish) has given...I would never expect it from a newcomer. This kind of performance comes only after 10 to 12 films...you become camera-friendly, in dubbing also your voice sounds good...," Sonu said.
"Girish has done it all in his first film itself. I think that's a beginning, you are going to see a superstar," added the 39-year-old.
'Ramaiya Vastavaiya' is a remake of Prabhu Deva's directorial debut Telugu blockbuster 'Nuvvostanante Nenoddantana'.
The film released in theatres last Friday.