well it is a no brainer if he should be in this team or not. i dont mean as a certain starter, but he is surely a nice option.
it comes to how we want to play next year: either you play him as the 6 with two creative players besides him, so he can win balls, cover ground, and pass the ball to them.
the other possibility is to play a kovacic as the 6, whose passes are better, but then we need two players besides him, who are prepared to cover ground.
all in all he is a very useful option to have, because he could also play as an emergency cb (always a position i wanted to see him in), and because he is a good defender and certainly a great runner (also not a bad passer, but not a main source of creativity).