On 29 December 2012, Mohun Bagan were barred from competing in the I-League for 2 years following a decision taken by the I League core committee.
[1] But on 15 January 2013, Mohun Bagan appealed the decision to ban them from the league and were reinstated, but would start on 0 points.
[2] A total of 14 teams contested the league, including 12 sides from the 2011–12 season and two promoted from the 2012 I-League 2nd Division.
ONGC as champions and United Sikkim as runners-up secured direct promotion from the 2012 I-League 2nd Division.
and Air India FC in the I-League both clubs will play at the Balewadi Sports Complex in Pune, Maharashtra until it is complete.