The Trinidad and Tobago striker wasn't at his best against East Bengal but his comments on the social media have created huge furore.
East Bengal rode on a Do Dong Hyun brace on Saturday to defeat arch-rivals Mohun Bagan in an I-League clash at Siliguri and boosted their chances of winning the maiden I-League title.
Cornell Glen, the Mohun Bagan striker who had a poor game on Saturday took to a social networking site after the match, alleging that Arnab Mondal had racially abused him during the course of the encounter.
The former Shillong Lajong player has already written a letter to the All India Football Federation (AIFF) informing the governing body about the incident.
"We have heard about the incident. Glen had come to us to complain about it and he is writing a letter to the AIFF as we speak. Mohun Bagan will support the truth," Sanjoy Ghosh, Mohun Bagan's manager told Goal.
This is the second time a player has reported a racial abuse on the ground, after Atletico de Kolkata's Baljit Singh Sahni accused FC Goa's Gregory Arnolin in the second edition of the Indian Super League (ISL).