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He would exchange thoughts with Keizer, the two sharing a video library of matches.
Michel Vonk, the former Manchester City defender who later worked with Slot at AZ Alkmaar, has fond memories of Slot's appetite for the game.
"You could already see the style changing in the first year that Arne was there," says Mannes.
"I know about some really clear presentations he gave to the players almost immediately.
"I think everyone who was a little close to Arne knew he was going to be the head coach after this." It was a leap forward for Slot - and for AZ.
'We were on a roll'
The following campaign was a fraught one for AZ in some respects.
It was achieved playing a brand of football that felt like the future for the club, a victory for Feyenoord and a victory for Slot's vision.
'One of the best with the media'
In the modern game, selling that vision to the players is only part of the job - selling it to the wider world can be just as important.
There is a feeling among those who know Slot and his work that it is the combination of playing style and personality that makes him the right fit.
"I have no doubt that he can relate to the people, he is tactically good and he is hard if he needs to be," says McDonald
But it is intense pressing too.
"If they want a coach who can organise a team with pressing but also be really good on the ball, without a doubt Arne Slot is one of those guys who will probably surprise a lot of people not that into Dutch football
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