Khan, 49, who recently watched the trailer of the action film, said Roshan and female lead Katrina Kaif are looking "like a million bucks."
"I wish I could dance half as well as Hrithik! I really loved the new song of ‘Bang Bang.’ And the ‘Bang Bang’ trailer is outstanding! Hrithik and Katrina look like a million bucks!," Khan posted on Twitter.
Roshan unveiled the film’s first romantic track “Tu Meri” last month where the lead pair could be seen doing some high-octane dance moves.
The “Dhoom:3” star is also amazed by the action scenes in the film.
"Love the shot of Hrithik come shooting out of the water with guns pointing! Can’t wait for Oct. 2!," Khan added.
Produced by Fox Star Studios, “Bang Bang” is directed by Siddharth Anand. It will hit theaters Oct. 2 along with Vishal Bhardwaj’s “Haider.”