Fernandes arrived at United from Sporting Lisbon in a deal worth an initial £47m during the January transfer window.
The Portugal international has become an instant hit at Old Trafford after playing a direct part in seven goals in his first nine appearances.
Shaw has been equally impressed by Fernandes's leadership qualities, with the 25-year-old not afraid to bark out instructions on the field.
"He's been amazing for us," Shaw said during a Combat Corona live FIFA tournament on Twitch
"The maddest thing is he hasn't actually been there that long but what he's brought in and the quality he has - of course on the pitch - but inside the dressing room as well. He's a leader for us too."
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