The team finished runners-up in the Calcutta Football League and a dismal tenth in the I-League.

They were crowned Champions in the Airlines Cup after Mohammedan refused to play the finals and gave a walkover.

Mohun Bagan crashed out in the group stage of the Federation Cup and were defeated by arch rivals East Bengal in the semi-finals of the IFA Shield.

All their results in the I-League were declared null and void and all their remaining fixtures were cancelled.

[2] However, on 15 January 2013, Mohun Bagan appealed against the decision to ban them from the I-League and were reinstated, but were fined a hefty amount, there officials were suspended from all AIFF meetings for one year and the team would start on 0 points and would play out only the remaining 16 fixtures in the league.