Guardiola says they must keep the midfielder quiet if they're to win the FA Cup final.
He said: "Bruno's influence on the game is outstanding. Incredible.
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"I watched a few games, his last games, and I said: 'This guy's creativity is one of the best I've ever seen'."
Fernandes , 29, has been playing for Manchester United since 2020. During this time, he played 230 matches in all tournaments, in which he scored 79 goals and 64 assists.
It was previously reported that he could leave United at the end of the season.