The People says Moyes has made the signing of a new centre-back his priority.
His first-choice target is Mangala, a highly-rated 22-year-old who plays for FC Porto.
But the Frenchman is also a major target for Chelsea, as People Sport reported earlier this season.
So too are United, but Moyes wants other options in case the French youngster decides on a move to Stamford Bridge.
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