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And just four months on from that proclamation, things are seriously taking shape for the German.
He's guided Chelsea to two finals, including a second consecutive Champions League final for him personally, and has created a team built on defensive resilience and swift, devastating attacking play.
Chelsea were languishing in ninth and seriously struggling but Tuchel has initiated quite the turnaround. But how has it done it? Well, some insight on the former Borussia Dortmund and Mainz boss' unique training sessions has emerged.
According to German football journalist Raphael Honigstein of The Athletic, Tuchel adopts an approach whereby the training is more complicated then the matches.
In the past, he's had his players play on pitches with no width or depth and even cut off the corners off the pitch to create a triangle in the final third.
He's even had defenders carrying tennis balls to stop them grappling with opponents, train on slippery surfaces and only able to control the ball with their knees.
His methods done "to make training so difficult and mentally exhausting that the actual games felt easy in comparison".
Tuchel is a subscriber to Professor Wolfgang Schollhorn's "differential learning" theory and is constantly trying to find new ways to challenge his players.
At first it takes some adjusting, but slowly but surely they buy into his ideas.
"At first, we wondered what these things had to do with football, but we realised quickly that they worked," said Neven Subotić, who worked with him at Dortmund.
In one of his first sessions at Chelsea, the Blues were spotted playing with a size 1 football to improve concentration.
Chelsea players have adapted to his way of working in quick fashion and they could now be set for a hugely successful season under Tuchel.
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