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Tottenham are now ready to go up against some of Europe's elite clubs in their pursuit of De Jong, but may wait until the summer to give him a full season in the Eredivisie.
Ajax managed to keep hold of their young talent despite two bids from Barcelona this summer but will expect a bombardment of bids next year.
But it is expected Barcelona have not given up on trying to sign him just yet, and De Jong has previously stated his desire to play alongside Lionel Messi.
The Catalan club also hope to secure a deal with Paris Saint-Germain midfielder Adrien Rabiot.
Watford 2-1 Tottenham: Hornets pull off great result by beating Spurs for first time in 31 years And the French giants could try and replace Rabiot, who refused a new contract this summer, with De Jong.
Mundo Deportivo also believe Manchester City, Roma and Borussia Dortmund will attempt to make a move for him.
But Ajax value their latest young talent, who they signed from Willem II in 2015, at around £40million.
De Jong burst on to the scene last season, with 22 league appearances and eight Eredivisie assists.
Dele Alli's long list of superstitions from bracelet's to eight-minute ice baths
Awkward moment Spurs keeper Michel Vorm hits goal kick out for a CORNER against WatfordHe has played in all four of Ajax's Eredivisie games this season and his strong performances have led to the star receiving his first international call-up for this week's fixtures.
In June, the whizzkid was asked about his promising future and he said: “I leave that to my agent. I do not know if he is working on it. Maybe, maybe not."
When questioned if he could promise to remain an Ajax player, he said: “Of course you can never promise that as a footballer.
“There may be a club tomorrow that offers so much that you are away. But as it stands, I play at Ajax."