The 24-year old Belgian defender is being linked with the likes of Liverpool, Arsenal, Tottenham and Bayern Munich and has revealed his interest in taking the next step in his career in one of the aforementioned leagues.
"England and Germany are the best leagues where I think I can take the next step," he told De Telegraaf.
"I have to go somewhere where I can play football a bit and where my style of play suits.
"On the other hand, I do not want to play for a team at the bottom of their league. I want to leave Ajax for a nice club, otherwise I'll just stay in Amsterdam."