Well, when ETH came to us he brought Alfred Schreuder (currently assistant manager at Barca) with him as his second man who was seen by many as the tactical mastermind and someone who was important as connection between the squad and ETH as he was good with the players (e.g. someone like Ziyech who was considered a difficult personality loved him). Currently, his assistants include people like Michael Reiziger, Richard Witschge, Winston Bogarde, and also Christian Poulsen before he left ... ALL ex-players from Ajax. And I also remember a funny story when ETH was linked with Spurs, so I don't think that Carrick would necessarily have to fear for his job if Man Utd would ever want to sign ETH if the following was true
Valentijn Driessen, chief football writer for the Dutch newspaper De Telegraaf has claimed that Tottenham were left surprised during their discussions with Ten Hag after he allegedly revealed that he had no plans to bring any of his current backroom staff with him to North London.
Driessen said as quoted by
Voetbal Zone: “Which they found very strange at Spurs , and we think it is very normal in the Netherlands that if you get a trainer you only get one trainer, but with the English you get a whole staff: a physiotherapist, doctor, assistant trainer, goalkeeper coach.
“You just enter there with a whole group. So they also asked him: who are you taking with you? Yes, nobody. They don’t know that there. He wanted Sjors Ultee, that name had also been mentioned. But you normally go there with a whole group.”