Sonam Kapoor was offered just Rs 11 for her role in Bhaag Milkha Bhaag

Rakeysh wrote in the book that "Sonam Kapoor benevolently accepted to play a guest appearance for a princely sum of Rs. 11 only for her brief portrayal of Biro." Rakeysh Omprakash Mehra also added that she lit up the screen every time she appeared in the film. Sonam also has fond memories of the film and has said that "I am the tadka in the film".

Rakeysh had directed Delhi-6 (2009) for which he had signed Sonam Kapoor as the film's leading actress. Both enjoyed working with each other a lot and the filmmaker decided to get her on board for his next, Bhaag Milkha Bhaag (2013), as well. However, she had a brief appearance in the film as the fictional muse of Milkha Singh, played by Farhan Akhtar.