ATK MB's first real opportunity of the game came midway through the first half when Boumous broke free on a counter-attack, shrugged off a challenge from Wangjam and managed to get a shot on target. Gurpreet Singh Sandhu, however, got a strong hand to the strike and parried away.
RoundGlass Punjab FC scripted history on Saturday as they clinched the I-League title with a game to spare.
Chhetri was shown the first yellow in the 22nd minute after bringing down Anirudh Thapa, something he repeated on the same player after nine minutes to be sent off.