Frenkie de Jong's agent says he is unable to confirm or deny whether Barcelona, Bayern Munich, Tottenham Hotspur and Manchester City have contacted Ajax director of football Marc Overmars to register an interest in his client.
The young Dutch midfielder is hot property and although Ajax were able to keep hold of him in the summer, the club could struggle to repeat the feat next year.
Real Madrid have recently been linked with lining up an €80m bid for De Jong, seeing him as the natural successor to Luka Modric.
Barcelona, Bayern Munich, Tottenham and Manchester City are claimed to have already been in touch with Overmars to register their interest.
But De Jong's agent Ali Dursun can shed no light on whether those claims are true.
He told Dutch daily De Telegraaf: "I can neither confirm or deny this.
"You should ask Marc Overmars.
"I send all clubs that contact me over to him", the agent added.
De Jong, who came through the youth ranks at Willem II before switching to Ajax, recently made his international debut for the Netherlands.
It is unclear how much longer Ajax can realistically keep the 21-year-old in the face of such substantial interest.
