The Amsterdam ArenA trio have the attention of numerous clubs in this summer's transfer window but none tempting enough to lure them away from the Eredivisie giants, which delights the capital-based club's coach.
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"It means that we’re doing something right and we’re happy with that. At Ajax they can develop. If those guys leave Ajax, we can be proud that they moved to a bigger club or competition.
"It’s an option for us to offer Toby and Eriksen a new contract. If these three guys stay at Ajax, we would be very happy."
De Jong has also indicated he was considering a move this summer, according to De Boer, who says the 24-year-old club captain could yet remain with the reigning Dutch champions.
He added: "I gave Siem a call during the holiday and asked what his feeling was. I was wondering if he had already made a decision about moving to another league. I also wanted to make it clear that we didn’t want to lose him.
"He said that he has a good feeling at Ajax and will only leave for a really good club. Right now he’s at Ajax and we’re happy with that."
Ajax forward Eriksen, 21, and defender Alderweireld, 24, have one year left on their deals, while De Jong is contracted until the end of the 2014-15 season.