Bagan are now third in the group with just 3 points from the first three matches. Bengaluru lead the group with 9 points following a 2-0 win against Dhaka on Tuesday, while Maziya moved above Bagan with 6 points following their win in Kolkata.
With one eye on a potential I-League title-decider against Aizawl FC on Saturday, Bagan fielded a second-string side for the clash, with Jeje Lalpekhlua the only player from their previous domestic game making the starting XI against Maziya.
Balwant Singh came close to putting the hosts in front in the 14th minute, hitting the bar with a long-range effort. It was evenly contested until Mohamed Umair put the visitors in front in the 34th minute with a strike from inside the box. It was the player's second goal in the competition.
With only the group winner set to make the inter-zonal semifinals in a changed tournament format, Bagan's chances of progressing to the next round look bleak, with a home game against BFC and visits to Maziya and Dhaka yet to follow.