The United captain has faced heavy criticism for his below-par displays at the club this season.
Rooney though says Maguire isn't the only United player to struggle with form and that the players 'need to feel winning again' to turn their fortunes around.
The Derby manager said on Monday Night Football: "I like Harry (Maguire). I know him personally.
"He hasn't been in his best form this season as a lot of players haven't. He goes and plays for England and looks like a world-class centre-back.
"Again a lot of it is confidence. The players need to feel winning again and winning consistently to get that confidence back. If they do that, I think Harry can be a big part of it."
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