Guardiola, Zidane, Lampard, Arteta, Simeone, Solkjaer, Flick, Koemann, Pirlo. Most top teams in the world are coached by former players. That is the current situation.
Mourinho is part of the old generation.
I know. 4 CBs is better than 3. Considering one is 34-years old and the other has a tendecy of picking up cards.
In that case, let's hope Koeman is right.