According to Hindustan Times, the actress will have her skin tone darkened to match the movie's lead actor, Tamil star Rajinikanth.
"We're applying a special imported technique to the film wherein the actors' looks, including their skin tone, has to be compatible," revealed a production source.
"In Kochadaiyyan, the demands of digitalised filmmaking are different. Deepika's complexion is many shades lighter than Rajiniji's. When we suggested that her skin colour should be suitably modified on screen, Deepika sportingly agreed."
The decision to darken Padukone's complexion was taken after a recent pre-production meeting with her and Rajinikanth.
Both Katrina Kaif and Vidya Balan were earlier considered for the heroine role in the movie.
Rajinikanth is making a return to film following health problems last year.