De Jong has forged a reputation as one of the most promising prospects on the planet thanks to his performances at the Johan Cruyff Arena.
And he would have moved to the Premier League last summer had Manchester City not shelved plans to slot him into Pep Guardiola’s squad.
Paris Saint-Germain and Barcelona have since been touted as his most likely destinations, with the Ligue 1 giants ready to hand over £67m for him.
However, Express Sport understands Tottenham are ready to battle it out with the big spenders for De Jong as uncertainty surrounds Eriksen’s future.
Spurs have been in touch with De Jong’s agent, Ali Dursun, to let him know they are prepared to match PSG’s offer for the 21-year-old.
And that summer raid on Ajax is likely to be bankrolled by the sale of Eriksen, who Tottenham are struggling to agree a new contract with.
Real Madrid have made Eriksen one of their top summer targets as they get set to tear Santiago Solari’s underperforming team apart.
And Florentino Perez is willing to stump up £100m for the 26-year-old, who has previously attracted interest from Barcelona.
Ajax will sell De Jong to the highest bidder, so Daniel Levy will have to break Tottenham’s transfer record to get him on board.
But the Tottenham chairman might have no choice with Eriksen handing an ultimatum to him earlier this week.
“[Tottenham] know what I want,” Eriksen said, when asked about the negotiations regarding extending his deal beyond 2020.
Eriksen did hint, though, that leaving Tottenham was not something he would consider until the end of the season.
“[The future is] not something I’m thinking of,” the Danish playmaker added.
“I focus on playing football, and there are many battles you have to think about which must be won.”
Eriksen is in line to start for Tottenham when they welcome Manchester United to Wembley on Sunday.
Mauricio Pochettino’s side sit third ahead of the showdown, nine points adrift of but with a game in hand on leaders Liverpool.