#1 Failing to tap the full potential of the Indian players

With the ISL now allowing only a maximum of five foreigners in the field at a time, the significance of Indian players has increased. ATK had some strong Indian players at their disposal but they failed to tap their full potential.
Defenders Arnab Mondal and Aiborlang Khongjee had represented India while Ricky Lallawmawma was coming off from a fantastic season with Mohun Bagan in the I-League. Among the midfielders, they had U-17 World Cup star Komal Thatal, India international Pronay Halder and Eugeneson Lyngdoh, Jayesh Rane who won the 2016-17 I-League with Aizawl FC, and midfield maestro Cavin Lobo. Even their forward Balwant Singh was selected for India in the 2019 AFC Asian Cup.
However, apart from goalkeeper Arindam Bhattacharya, none of them failed to live up to their calibre. Eugeneson Lyngdoh and Arnab Mondal were only given chances late into the season and their rustiness cost ATK.