Ratner had edited the English version of Hrithik and Mexican actress Barbara Mori starrer "Kites", and since then they share a strong friendship.
Hrithik recently saw Ratner's "Tower Heist" and was left impressed. He took to micro-blogging site Twitter to congratulate the filmmaker.
"Brett Ratner long time! Just watched 'Tower Heist'! Super film! Brilliantly directed! You are the man Brett! hope all is well...Cheers my friend, " the 38-year-old tweeted.
To that, the 43-year-old filmmaker replied: "Hrithik thank you... I heard you are in the biggest hit in India. Can't wait to see it... Working on a big idea for us to collaborate."
From what it seems, there's another Hollywood-Bollywood collaboration in the pipeline.