Alvaro Morata is fast becoming Chelsea’s head boy after scoring a third goal with his noggin this season.
The Spaniard’s opener made it three goals in four games since his £67million signing from Real Madrid.
And it put defending champions Chelsea on the path to victory over the previous season’s Premier League winners.
N’Golo Kante, a stalwart in both those title-winning sides, scored the visitor’s second, putting the game beyond Leicester who could only pull one goal back through Jamie Vardy’s penalty.
Frenchman Kante managed just one top-flight goal in his season with Leicester and only one with Chelsea last season.
So it was no wonder that it took Leicester boss Craig Shakespeare by surprise.
He said: “With hindsight we’d have wanted someone to close the ball a bit quicker… although N’Golo is not renowned for shooting from distance.”
Kante’s celebration was muted, and he said: “It’s always nice to score but it was my old team so I kept it inside.”
Kante will be hoping it’s not his last of this campaign but if it is then at least it was decisive.
It wasn’t just his strike — a low, driven effort from 30 yards — which stood him out from the crowd as man of the match but the way he consistently broke up Leicester’s possession.
He positions himself so well he rarely needs to make a tackle, nicking the ball away from his old pals time and again then setting up his more forward-thinking team-mates.
Chelsea boss Antonio Conte added: “N’Golo played an amazing game and we are used to see this. He’s a fantastic player.
“He makes good runs and he’s improving his passes and finishing.
“It’s very important to see this player is improving — he is now a really top player.”
Jamie Vardy's goal
Stonewall penalty as Begovic hacked down Vardy.
And the England striker picked himself up to fire down the middle.
Could it spark a comeback?
N'golo Kante's goal
That is a collector’s item, a Kante goal.
It was a lovely finish as well, he hammered one from 30-yards out.
Tried his hardest not to celebrate against his former club as well
Alvaro Morata's goal
Morata’s goal is the difference between the two sides at half time.
Top header as well, from a decent cross.
The front man has been lively through out the half before finally scoring.
Early action
Fairly even stuff so far.
Morata has had a couple of chances but can’t find a way past Schmeichel.
Vardy has been lively at the other end.
Leicester boss Craig Shakespeare has cleared the air with Riyad Mahrez following the midfielder’s antics on transfer deadline day.
Mahrez took the remarkable step of leaving the Algeria national squad in order to try to force a move away from the King Power Stadium.
The 26-year-old, who submitted a transfer request at the start of the summer, surprised Leicester with the move last week, with the club learning about his intentions via a Tweet from the Algerian FA stating that Mahrez had been given permission to leave their training camp to finalise a move.
Since his return from international duty, Mahrez has met with Shakespeare to explain his actions and the Leicester boss has praised the player for his honesty.
Asked if he knew Mahrez’s whereabouts on August 31, Shakespeare said: “I did try to call him but it was an international dialling tone and I wasn’t quite sure where he was. I would have suggested he was at an airport somewhere.
“I think the main content of the conversation between me and Riyad will stay private but what I will say is he was very transparent from the word go.
“In the conversations I had with him he said he wanted to play for a top six club. He made that very clear. And I can understand from him and his advisors what they were doing.
“But having talked to him over the last couple of days I am in no doubt of his professionalism and commitment to Leicester.”