De Boer has claimed there had been contact, prompting Spurs to issue a denial on Wednesday having said last month they would assess their options at the end of the season.
However, Ronald, who is youth team coach at Ajax, believes Frank would be a good fit for the Londoners.
"It is a nice club with history, one of the nicest clubs in the Premiership," he said. "The club has ambition and the budget for it.
"Frank knows some of the players there, like (Christian) Eriksen and (Jan) Vertonghen - (Nacer) Chadli and (Mousa) Dembele too - there's lots of quality at the club. I think he can build something.
"Frank's feeling is important, the club's philosophy is as well - what kind of football they want to play - that will be decisive. He will take his time, to think about it."
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