"I like him as a player for sure, he's fantastic," De Boer was quoted as saying by Gazzetta World.
"He is very happy at Manchester United, though, and played in the Community Shield.
"I know his situation and I think he's very happy and playing with confidence, but we'll see in the future.
"Of course, any of my ex-players from Ajax are guys I like to keep an eye on and watch them very closely. I do the same with [Christian] Eriksen, [Toby] Alderweireld, all of those guys. I like to follow them and I do the same with Daley."
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