De Boer has bemoaned seeing so many to prospects leave the Ajax academy for England, only to fail to reach their potential while playing within the English development system.
The Dutch great name-checked Juan Familia-Castillo, of Chelsea, after seeing the wing-back turn out for loan club ADO Den Haag on the weekend. De Boer was well aware of Familia-Castillo as he was coming through the Dutch system and was convinced he'd become a major player.
De Boer also mentioned former Chelsea striker Daishawn Redan, now with Hertha Berlin, and PSV Eindhoven striker Donyell Malen, formerly of Arsenal, when lamenting the early departures from Ajax of so much young talent.
"With Daishawn Redan and Donyell Malen, who has now also returned, he has not done it at Arsenal either.
Meanwhile, former Dutch coach Aade De Mos also offered a harsh judgment on Familia-Castillo, after his appearance in ADO Den Haag's defeat at Fortuna Sittard.
He added, "It was sixteen degrees in Geleen last night (actually Sittard) and you play with your gloves on? So he is also not good in the head."
- updated February 23
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