Veltman impressed and could be sold this summer.
Ajax director Marc Overmars said: “I will fight to keep Veltman. We don’t want him to go. He is a massive talent and players have been leaving this club too early in their careers.
“Veltman is a sensation. We never expected him to make such an amazing breakthrough at top level. But that’s down to the work of Jaap Stam.
“Joel gets defensive lessons from the biggest of all defenders. Jaap has been working on him really hard with individual coaching at Ajax.’’
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