The Chelsea manager’s brilliant reaction was caught on camera as Kante netted his side’s second goal in a 3-0 victory at the King Power Stadium.
Tuchel lifted his arms up and turned toward his bench in bewilderment after the Frenchman skipped through the Foxes’ midfield before firing a left-footed strike past Kasper Schmeichel from the edge of the box.
“Kante blew his mind!” one fan wrote after seeing Tuchel’s reaction.
“Tuchel is too joke. The way he held his hands in apology after Kante scored,” another said.
Another wrote: “The man is in complete awe, that’s what Kante does to people!”
The Blues cruised past Brendan Rodgers’ side in what was arguably their best performance of the season so far.
German defender Antonio Rudiger opened the scoring with an expertly guided header from a Ben Chilwell corner, before Christian Pulisic put the game to bed in the second half after squeezing the ball home from six-yards after being put through by Hakim Ziyech.
The Blues also had three goals disallowed for offside in the second-half as Tuchel’s men turned on the style.
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The home side struggled to get a foothold in the game, and Chelsea keeper Edouard Mendy was only properly tested once by a long-range effort from Leicester’s Daniel Amartey.
The win puts Chelsea six points clear at the top of the Premier League, though their rivals have a game in hand.
Leicester meanwhile remain in 12th place with just four wins and five losses from their opening matches as they continue struggling to replicate last season’s form.