I see some serious underestimating of MArtinez' capabilities on here. Due to a lack in height (which factually is true. He is very small for a centre back. But I'm 100% sure that playing in a high line will leave him not too exposed. Plus he is a very good timer and agressive duellist, so I'm certain he will do fine aerially). also due his supposed lack of speed, which is simply untrue. He is fast enough, especially on longer distances. I think Martinez is the most sure thing to perform on the top-level next season out of all Ajax players from last season, and that includes MAzraoui, Timber, Antony and Gravenberch.