Chelsea headed into the game having finally found some form under Graham Potter.
The Blues beat Leeds and Borussia Dortmund in their previous two outings without conceding a goal.
And when all was said and done at the King Power, the Foxes came away with a 3-1 in.
Ben Chilwell, a former Leicester player, opened the scoring with 11 minutes on the clock.
The wing-back celebrated by putting his fingers to his ears, a clear message to those who once cheered for him at the King Power:
“It was probably one of the most enjoyable goals of my career,” Chilwell told Chelsea’s in-house media after the game.
“There’s no bad blood at all, I really enjoy coming back here and seeing all of the old faces that I used to see all the time day to day. But when it’s that 90 minutes on the pitch, of course I’m going to give everything to win the game for Chelsea, and thankfully today I contributed with a goal.”
Chilwell was delayed in making his way over to the Chelsea supporters after the full-time whistle; there were former teammates and staff to speak with first. But he did eventually jog jubilantly across the pitch and celebrated passionately with those in the away end.