Madueke is battling for regular minutes this season.
But Boothroyd said: "He's certainly a very talented young man, really excited to be called up by the Under 21s, and a little bit like Phil (Foden) last time, nobody had really heard of him until he came and played in the tournament.
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"They knew a little bit about him, but that set him off on a trajectory and we're hoping Noni can create even more positive attention for the way that they play.
"He's got a lovely infectious character that comes out even over the phone."