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The 2020–21 I-League is the 14th season of the I-League, one of the top Indian professional football leagues, since its establishment in 2007. (Officially known as Hero I-League, due to sponsorship reasons).
Mohun Bagan were declared the champions of the 2019–20 season after the cancellation of matches, due to the COVID-19 pandemic, since the second placed team could not catch up even if all 20 games were completed. However, ATK, a club which plays in the Indian Super League (ISL), merged with Mohun Bagan and as a result they will be playing in the 2020–21 ISL season. Hence, for 2020–21 I-League season there is no defending champion.

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