Subhasish Roy Chowdhury had just capped off a phenomenal debut season in the Indian Super League (ISL) with ATK after winning the title in its maiden edition. Although he was benched in the latter half of the season after Armenian goalkeeper Apoula Edima Edel Bete was promoted to the first XI, his spectacular performances in the initial matches caught the attention of several clubs in the country.
In December 2014, East Bengal announced that they have won the race to sign him for the 2014-15 I-League season. In spite of having Abhijit Mondal, Abhra Mondal and Luis Barreto in their ranks, the Red and Golds chose to rope in Roy Chowdhury.