Mendes playing for new United manager Ruben Amorim at Sporting CP before leaving for Paris two years ago.
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The Daily Mail says Amorim wants a left-sided attacking wing-back signed to accommodate his 3-4-3 system.
United are also competing for Bayern Munich flyer Alphonso Davies and Bournemouth youngster Milos Kerkez.
With PSG, Mendes is a three-time Ligue 1 title winner.
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