ATK Mohun Bagan was born, when two of the most successful teams, ATK and Mohun Bagan in history of Kolkata and Indian football merged this year. The teams won tier-1 (Indian Super League) and tier-2 (I-league) leagues of Indian football last season.
ATK Mohun Bagan held the DNA of ATK last year, keeping most of the high-performers, there are very few changes.
Manager
Antonio Habas
Squad – ATK Mohun Bagan
[table id=71 /]Preview
Fixtures – ISL 2020-21 – ATK Mohun Bagan
| Match # | Home Team | Away Team | Date | Venue |
| 1 | Kerala Blasters FC | ATK Mohun Bagan | November 20, Friday | GMC Stadium Bambolim |
| 8 | SC East Bengal | ATK Mohun Bagan | November 27, Friday | Tilak Maidan Stadium |
| 15 | ATK Mohun Bagan | Odisha FC | December 3, Thursday | Fatorda Stadium |
| 20 | Jamshedpur FC | ATK Mohun Bagan | December 7, Monday | Tilak Maidan Stadium |
| 24 | ATK Mohun Bagan | Hyderabad FC | December 11, Friday | Fatorda Stadium |
| 30 | ATK Mohun Bagan | FC Goa | December 16, Wednesday | Fatorda Stadium |
| 36 | ATK Mohun Bagan | Bengaluru FC | December 21, Monday | Fatorda Stadium |
| 42 | Chennaiyin FC | ATK Mohun Bagan | December 29, Tuesday | GMC Stadium Bambolim |
| 46 | ATK Mohun Bagan | NorthEast United FC | January 3, Sunday | Fatorda Stadium |
| 55 | ATK Mohun Bagan | Mumbai City FC | January 11, Monday | Fatorda Stadium |
