Chennayin FC now have two wins from as many matches while Kerala are at the bottom of the table having lost both their games in the inaugural tournament.
The Chennai outfit got the lead through their best player and Brazilian import Elano Blumer via a spot-kick while Scottish striker Iain Hume's powerful volley from the close range brought the equaliser.
However it was the magical goal by Mendy in the 63rd minute that made even Sachin Tendulkar, clad in canary yellow Kerala Blasters jersey, applaud while Amitabh Bachchan, co-owner Abhishek Bachchan and Tamil mega star Rajnikant erupted in joyous celebration.
The Frenchman, while playing for Hull City, had scored against Manchester United in a Premiership game in 2010 which Hull lost narrowly to the Red Devils by a 3-4 margin.
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It was a game that was dominated by the Chennai team playing in their navy blue jerseys.
It was in the 14th minute that East Bengal stopper Gurvinder Singh's ill-timed tackle saw Das sprawling inside the penalty box. The referee pointed at the dreaded spot and Elano did not make any mistake in putting it past James.
For Blasters, the problem has been the slowness of a distinctly overweight Michael Chopra, who has clearly left his best days far behind.