Sahni further stated in an interview with The Hindu:
I felt why has the girls’ team been given so little coverage. I shared the idea with Aditya [Aditya Chopra]. He liked it and said stop everything else and concentrate on it. I started my research by spending time with hockey players [...] It’s just a matter of chance that Negi's story matches with Kabir Khan. There are many cases, like in Colombia, football players are killed for not performing well for the club. I had no idea about Negi’s story while writing the script, and he joined us after the script was ready. In fact, his name was suggested by M. K. Kaushik, who was the coach of the team that won the Commonwealth Games’ gold. On day one, when Negi read the script, he cried and it was then that we came to know about his story.[9]
Sahni further noted that, "the story of Chak De was deeply inspired by the real life story of ex Chief National Coach Maharaj Krishan Kaushik and his Indian Women's hockey team's real feat of winning the Commonwealth and many other championships."[10]
Both Kaushik and Negi did influence the development of the film after being approached by Sahni. Sahni first met with Kaushik and later recalled that, "M K Kaushik and his girls taught us all we knew about hockey. Then he recommended Negi to us, because when we finished writing and finished casting, we needed someone to train the girls. Negi assembled a team of hockey players to train the girls."[11]
Kaushik also stated in the same interview, "I taught him everything about the game, starting from how the camp is conducted, how the girls come from different backgrounds and cultures, the psychological factors involved. Also how the coach faces pressure to select girls from different states and teams."[11]
Sahni also contacted Negi and asked him to coach the actors portraying the hockey team. Negi agreed and trained both the girls and Shahrukh Khan for over four months.[12]
^"Back to the goal post". The Hindu. 10 August 2007. Archived from the original on 13 April 2008. Retrieved 23 April 2008.{{cite web}}: CS1 maint: unfit URL (link)
^"In the company of ideas". The Hindu. 7 September 2007. Archived from the original on 29 October 2008. Retrieved 23 April 2008.{{cite web}}: CS1 maint: unfit URL (link)
^Lokapally, Vijay (10 August 2007). "Back to the goal post". The Hindu. Archived from the original on 13 April 2008. Retrieved 7 April 2008.{{cite web}}: CS1 maint: unfit URL (link)