With this win at the Bangalore Football Stadium, Bengaluru FC kept their unbeaten record at home intact while Shillong Lajong's six-match unbeaten run in the league came to an end.
Bengaluru FC now have 21 points from 11 matches, while the North Eastern side remain on 14 points.
Man of the match, Chhetri opened the scoring for his team in the seventh minute. After a smart move from the left flank, he managed to put the ball past the Lajong keeper Vinay Singh after a perfect one-two with Robin Singh.
The visitors pulled one back in the 81st minute with a brilliant goal from Boithang Haokip. Haokip's curling left footer from a free kick outside the box beat Bengaluru FC keeper Pawan Kumar. The home side managed to cling on to the one goal lead to pocket full points from the match.
Bengaluru FC could have won by a bigger margin had they not missed some easy chances from close range. The home side were also unlucky in the 20th minute when Beikhokhei Beingaichho's header hit the cross bar.