Tiger will step into the shoes of Hollywood star Sylvester Stallone for the remake.
The movie will be directed by Siddharth Anand, who had previously helmed Hrithik Roshan starrer "Bang Bang".
"There is no prep work as such for the film as I am busy with the promotions of 'Munna Michael'. And then I have 'Baaghi 2' and 'Student of the year 2' to do.
"'Rambo' is still far off. The prep work will be exhausting especially (as) there are lot of expectations and it's cult action film featuring one of the legends of Hollywood. I don't replace him I am just giving him a tribute," Tiger told reporters here at a promotional event of Hindi version of "Spider-Man: Homecoming".
"Definitely, I will be more at ease for sure as we (Disha and I) share a great bond and I am more comfortable with her.