A very good article about Slot and I think this is the crucial part about why his tactics work
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So what are those ideas?
“They’re very attacking, very aggressive, with a lot of pressing,” says Martijn Krabbendam, a journalist for Voetbal International who has covered Slot’s Feyenoord. “High intensity, a lot of energy, and they can only do that if they’re very fit.
“He always wants to play attacking football, he always wants possession, he always wants a good set-up from the goalkeeper to find free space and free players in the midfield. It’s no secret he is crazy about Guardiola — he’s an example.”
Before he became Breda coach, De Graaf spent a week with Slot at Feyenoord, observing how he works. “Every session is with high intensity,” he says. “Every workout, passing drill, or five vs five — everything is with high intention and everything is with an idea. Every player knows exactly what he wants from them. He’s good at making clear why he’s doing certain exercises.
He’s as honest as possible, so the players really like him.”
Slot believes his teams have to be intense because it essentially gives them two ways to win: if the quality of their play is lower than that of their opponents or they are having an off day, they can win by outrunning and outworking whoever they are playing.
There is also a recognition of, and mitigation against, the fitness concerns that come with such an intense style of not just playing, but training. He works closely with his data and fitness teams: when they tell him a player’s numbers are dropping or they are in the ‘red zone’, he will ease off.
Transitions are quick and passing is certain. Slot likes to work with younger players who are keen to learn. “If you have a young group, then, as a trainer, you can take the boys through videos in your desired playing style,” he said a few years ago.
For example, when Tyrell Malacia left last summer for Manchester United, he chose to replace him at left-back with the 20-year-old youth team product Quilindschy Hartman. When he needed a central midfielder, he took 22-year-old Mats Wieffer from Excelsior Rotterdam in the Dutch second tier. Both were subsequently called up to the Dutch national team. Most of the key players this season are 24 and under — there are only three outfielders in the squad who are older than 25.
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There is no way our current squad is built for someone like Slot.