This was their third winless match on the trot.
India international Jeje Lalpekhlua, who missed a penalty in Mohun Bagan's 1-2 loss against East Bengal last Saturday, put the defending champs ahead at the Jawaharlal Nehru Stadium. Brazilian striker Uilliams Bomfim equalised for the home team.
The match was tied 1-1 at half time.
Japanese midfielder Katsumi Yusa put Mohun Bagan ahead in the 77th minute only for Bomfim to score his second goal in the fifth minute of added time to snatch a point for his side.