The 21-year-old has put pen to paper on a long-term contract after passing medical and agreeing personal terms.
The match became the stuff of dreams and folklore, and the 11 Bagan players that played in that match were immortalized.
Jarnail Singh contained future Ballon d'Or winner Florian Albert admirably in a group league match against Hungary, in the1960 Rome Olympics.
Now 36, Chhetri has been a part of the Indian football side for 16 years as his international debut had come June 12, 2005, against Pakistan.
The duo returned positive after all the ATK Mohun Bagan team members underwent coronavirus tests at a private hospital in Kolkata on May 7.
IM Vijayan was the first Indian footballer to win the AIFF player of the year award multiple times.