Both will be seen together in a commercial for Kalyan Jewellers.
"I am working with Amitabh after a long time. It's always a learning experience to work with him. He is very encouraging. There is so much to learn from him,” Nagarjuna told reporters here.
The 53-year-old last worked with Big B, 70, in 1992 released film “Khuda Gawah” and recalling those days, he said: "We had shot the film in Nepal and it was a wonderful experience and it's been 20 years for that."