The classic Franz Beckenbauer type of CM/CB. Ajax are dealing their best players exclusively with Tottenham this decade so I don't see this kid at Barcelona.
I think he is better further up the pitch as a Modric type of midfielder. He is simply providing too many assists and key passes to play as a CB. Even though he is doing well there. I would gladly see him at the club. Lyon and Ajax have some excellent young players we should follow. Lets see how their seasons progress.