The Mirror says United have put money aside and drawn up a six-man shortlist ahead of the winter transfer window.
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Topping the list is Brighton midfielder Carlos Baleba, who was priced out of a move to United over the summer.
Also featuring is Atletico Madrid's Conor Gallagher, formerly of Chelsea, along with young England pair Adam Wharton (Crystal Palace) and Elliot Anderson (Nottingham Forest).
Ending United's wishlist is Chelsea youngster Andrey Santos, who is being tipped for big things, despite his struggles to gain a regular start this season.