"I have always admired him as an actor. I have seen his south films. I have seen 'Raanjhanaa' also. He is a very accomplished actor and he is a huge star," Amitabh told reporters here.
The 72-year-old also believes that Dhanush is a "wonderful choice" for the role, which is said to have been offered to Shah Rukh Khan first, in "Shamitabh".
"Now that I have almost seen the product of our film, I do feel that he is a wonderful choice," said Big B.
Directed by R. Balakrishnan aka Balki, "Shamitabh" also features Akshara Haasan.