This is about more than the idiosyncrasies of two super-obsessive men, though. The fact they meet again in club football’s greatest fixture illustrates how this intense mindset has gradually taken over the elite end of the game. It isn’t quite revenge of the nerds, to use Tuchel’s own word, but it is a reflection of how a higher level of thinking generally leads to a higher level of performance. Some managers will inevitably beat them in any individual match - or even over a brief period of time - but if they can’t match them in preparing for every square metre of the pitch, the gaps only grow greater over time. Put simply, less is left to chance
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You might even call it the “NFL-isation” of football. The game is just so much more rigorously prepared than even a decade ago. Bill Shankly’s maxim is no longer true. Football is no longer a simple game complicated by idiots, but an increasingly complex game, enriched by “geniuses”. It naturally lends itself to those who obsess over every millimetre.
Much of this comes from the tactical evolution first sparked by Guardiola himself at Barcelona.
"I think, 10 years ago, Pep created a new idea of football," Reschke argues. "It was the main influence on football in the last 30 years. All of the intelligent young coaches - every one of them, Julian Nagelsmann, Thomas Tuchel - is influenced by him. You can see it in England, too."
Guardiola's possession-pressing game was gradually complemented by advances in sports science and analytics. They caused a huge leap forward in team preparation. All of this combined to ensure football became infinitely more co-ordinated, from pressing to attacking.
For most of football’s modern history, defending was necessarily predictable and organised, while forward play was freeform in order to encourage creation. This is one other element that has been turned on its head by coaches like Guardiola.
Fabregas recently told the Wall Street Journal that he realised the true extent of this under Antonio Conte at Chelsea in 2016. “It was more like, ‘You have to do what I want you to do. You will do this, and we will repeat it over and over again, for months and months, until you get it right. And we will play like a mechanized robot thing. You can play with your eyes closed. The ball comes to you and you know what you have to do, because your teammate will be exactly at the right time at the right place".
Tuchel isn't identical, but he is along the same path. The German spent one Chelsea press conference speaking about how his approach is to put in place a structure that eventually puts players in the position to show “their creativity”. Almost everything is co-ordinated until the moment of decisiveness.
“It’s just to give possibility, and from the possibilities it is the free choice of the players,” Tuchel explained. This is what Guardiola has also taken on, as his own approach has evolved since Barcelona.
"Football has developed,” Reschke concurs. “It is now like American football, where you have special coaches. OK, not exactly the same, but closer and closer. Football is at a new level. A fantastic level. You need coaches who can read games, who can present teams with solutions. More coaches come up with special plans, so success becomes dependent on smaller details.”
This is why Tuchel starts screaming at players when they are a metre out of position. It can make the difference between, say, one-on-one defending working dependably and proving a disaster. This is the level now, where tactical approaches that push the limits require players to push the limits too.
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It can be a little hard to square that kind of obsessiveness with another side of the game, where successful managers like Zinedine Zidane talk so vaguely about “enjoying the ball”.
“Football is played by humans so there are a lot of factors, but it is incredible that clubs like Juventus and Chelsea have just gone for former players like Andrea Pirlo or Frank Lampard,” one official who has worked at a top club argues. “Who knows if they are even up to it? The game has moved way beyond talking about mentality or experience. It’s much more sophisticated than ever before.”
Much of this becomes apparent on the training ground. That, to a far greater degree than ever before, is where games are really won and lost. That is the only place players can really learn and internalise the intricate approaches set out by coaches like Tuchel and Guardiola.....
“What we try to implement in training is the mix of respecting your zone," Tuchel explained in February, "and to have a structure and then the freedom for the creativity and the quality and the intuition of players. That is a constant mix.”
It is why Tuchel is constantly “demanding”, according to captain Cesar Azpilicueta. “Training is very specific,” Cesar Azpilicueta says. “His focus is on every action, when a player is out of position."
This is one area, nevertheless, where Tuchel is said to be more “relaxed” than Guardiola. The Catalan’s sessions are said to be innovative, but what really elevates them is the manic intensity.
One drill for example involves three players standing in a column, but all moving along rows at the same time while passing to each other. The idea is that the ball always keeps moving between them at the same pace. That’s fine when that pace is relatively relaxed. That is not what Guardiola demands.
There are common refrains that ring around the training ground. “No, no, no! Always fast, the ball never stops!”
One training ground source says "it would give you a headache". This is why people say Guardiola's intensity has a finite effect, and why many felt that was the case at City earlier this season. Players continue to buy in, however, when they continue to see spectacular results.
“Joshua Kimmich told me that, after one year of Pep, he would be nervous before every training session,” Reschke reveals. “He knows he has to be focused. There is no idle talk. When you train with Pep, everything is top level. He shows you how to pass, how to stand when you receive the pass… he just opens your door in football. The difference is the detail.”