Krol admits he's keeping an eye on Atalanta midfielder Marten de Roon, Inter Milan wing-back Denzel Dumfries and Donyell Malen, of Roma.
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He told La Gazzetta dello Sport: "I really like Malen. Now he's playing more centrally; it's a surprise, but I think he can do well.
"Also De Roon, a good player, intelligent. And then Dumfries: a great player, he's finding his ideal form again."
Krol also reflected on Napoli's campaign this season.
He added: "The injury problems have been a disaster. But despite this, they've never dropped below fourth place, which shows how strong they are."