Mohun Bagan Super Giant began their AFC Champions League 2 campaign with a disappointing 1-0 home loss to Ahal FK on September 16, 2025. The Indian side dominated possession for large periods but fell to a sucker-punch from the visitors from Turkmenistan in a match of fine margins. Mohun Bagan created several half-chances in the first half but were unable to find a breakthrough against a resolute Ahal defense. Against the run of play, Ahal scored what proved to be the winner midway through the second half, converting one of their few opportunities on the counter. The home team piled on the pressure in search of an equalizer, hitting the post in the dying minutes, but could not find a way past the inspired Ahal goalkeeper. The result was an early blow to Mohun Bagan's qualification hopes, giving Ahal a vital three points on the road. The Mohun Bagan coach expressed frustration at his team's lack of clinical finishing in the final third.