While Cristiano Ronaldo and Lionel Messi dominated headlines in the summer with their mega moves to Manchester United and Paris Saint-Germain respectively, Tuchel insists Kante is his world-beater.
The Chelsea manager was angered by his side’s first-half performance at rivals Spurs on Sunday, so sent for the World Cup-winning midfielder to turn the game.
The European champions secured a 3-0 win that keeps them level on points at the top of the table and still undefeated this season. And Tuchel hailed Kante’s impact.
“He is a top player,” said the German. “If you have N'Golo, you have something everyone is looking for.
“You have everything that you need in midfield with work rate, intensity, ball wins, skilful play, off the ball, with the ball, dribbling and even a goal. I see this every day in training and it is hard to believe how good he is.
“He doesn't make a foul in ball wins. He plays excellent in every possession game in training. He is a unique guy. There's no more words needed from me. N'Golo is N'Golo. He is fantastic.”
Tuchel was heavily critical of his players, questioning their attitude in the first half and accusing them of sloppiness.
That is why he turned to Kante, who even claimed a rare goal after his long-range effort deflected off Eric Dier.
Thiago Silva and Antonio Rudiger scored either side of that strike as Chelsea totally dominated after the break.
“We forgot to bring the right attitude and energy to this game,” Tuchel added. “This had to change and, well, if you have N'Golo on the bench and you want to step up in these parts of the game, it's the best player to bring on because he is unique and can change any momentum.
"We wanted a higher intensity and work rate in our match to win balls actively and put the match in the opponent's half. Then we can rely on our skills, that was the idea behind it. The reaction was absolutely needed, but we showed it and played a very strong second half to deserve this win."
Despite Tuchel’s frustrations, it was another game in which Chelsea underlined their title credentials.
He said: “I am happy, but it is our job. We want to be competitive. We have to get better. I believe we have to get better because I believe everybody will get better in the league because it is only September.
“When I say we want to get better or we are not on our very highest level, it is not an excuse for (not) being competitive. We want to be competitive. I want to win every single game in which we compete and this is what the club demands and what I demand and this is what we are.
“We are self-confident and the team shows that they can make it through difficult situations and keep the belief up high. Today was another lesson and it’s still stuff to improve and we are very happy with the way we are able to produce wins consistently.”