Speaking at a press conference he commented on the actor's chemistry with co-star Katrina Kaif saying they look wonderful together, Bollywood World reports.
"It is very nice they have done a few movies together. I think chemistry is too deep a word... media has created it. Kajol and I always had this issue, 'What is this chemistry?' It has taken me years to understand what this means," he said.
The Don 2 star, who had a public falling out with the Bodyguard star, wished Kaif and Salman luck for their film.
"I don't know about the chemistry but it looks like a wonderful pair," he said. "I wish them all the luck."
Kaif will soon be seen with Shah Rukh in an untitled project directed by Yash Chopra.
It is the first time Kaif has been paired with Shah Rukh. The Zindagi Naa Milegi Dobara star recently said that she was 'desperate' to make a movie with Shah Rukh Khan.
The film also features Shah Rukh's Rab Ne Bana Di Jodi co-star Anushka Sharma.
The Don 2 actor who is celebrating 20 years in films said it had been "a pleasure, honour and wonderful experience to work with Katrina and Anushka Sharma".