Nigel Pearson was left disappointed with Leicester's defensive frailties as they succumbed to stylish Chelsea at Stamford Bridge.
Early goals from Gary Cahill and Salomon Kalou set the Blues on their way before Fernando Torres ended his goalscoring drought with a brace. Raul Meireles was also on target for the free-scoring Blues towards the end.
Jermaine Beckford and Ben Marshall grabbed consolation goals for the Foxes, who will now go back to trying to force themselves into the Championship play-off picture.
And Pearson admitted: "We gave ourselves a mountain to climb.
"Going into the game I think we always knew it would be important to make Chelsea work hard to be in front and we didn't do that.
"It was always going to be a tough ask but we always had to keep things tighter than we did. To concede from two set-plays is particularly disappointing.
"I felt we created a number of chances throughout the game and our attacking play at times was very good, but unfortunately when you play against quality players like we have today and the defensive side of your game is not spot on you're going to get punished."