When asked if it was intimidating to work with Big B, Farhan told reporters here: "It was not intimidating. I was really excited (to work with him). So that was the predominant kind of emotion."
"Anxious to a certain degree of course, because you kind of want to be there with him because you know what he is capable of doing. So I was just anxious about that. I think those were the two main things," Farhan added.
Farhan, who directed the 73-year-old thespian in 2004 war drama Lakshya, said that he had an "out of body experience" on the "first day of shoot" with Amitabh.
The 41-year-old actor will be seen playing the role of an Anti-Terrorism Squad (ATS) officer named Daanish Ali in Wazir.
When asked how different this is role from the others that he has played, the Dil Dhadakne Do star said: "It's a completely different part. It's a completely different film. So you can't compare." (Also Read: Amitabh Bachchan Says Working with Farhan Akhtar Was 'Tough' )
Directed by Bejoy Nambiar, Wazir is co-produced by Vidhu Vinod Chopra and Rajkumar Hirani.
The film also features Aditi Rao Hydari, Neil Nitin Mukesh and John Abraham in pivotal roles.
Wazir is slated to hit screens on Friday.