Dipanda Dicka started from where he left in the last match against Mumbai FC getting the hosts an early breakthrough in the 20th minute and following it up with another goal in the 65th minute.
There was no respite in sight for Chennai who were left doing the defending job for the most part of the match as the hosts held firm to the proceedings.
That the Marcos Vinicius and Charles De Souza combination never got going for Chennai also helped the cause of the hosts who looked the fitter of the two sides.
Buoyed by two wins on the trot at home against Minerva Punjab and Mumbai FC, Lajong started the proceedings on a dominant note looking to control the game from the outset.
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The first real chance came Lajong's way when Dipanda crossed one back to Redeem Tlang from far right only to see the local forward smash it to the goalie to enforce a rebound.
Five minutes later, following an excellent assist from Issac, Dipanda headed one into the net from inside as the sizeable crowd at the stadium went into raptures.
Chennai did look like making a comeback towards the fag end of the first half but some solid defending by Lajong kept them at bay at half time even as a couple of balls flew over the crossbar.
After resumption, Marcos wasted a decent opportunity to secure Chennai the equaliser when he lost control of the ball inside the box in the face of a diving Vishal Kaith.
Chennai coach Robin Raja brought in Denson Devadas in place of Sena but Lajong seemed unperturbed.
Chennai's efforts thereafter to stage a comeback bore no results as the hosts romped home to another victory.
What was probably more relieved to Lajong coach Singto was the fact that his side could finally maintain a clean sheet.
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