The 20-year-old has found himself on the fringes of the first team since Louis van Gaal took over last summer, despite impressing in the season before under David Moyes. If the Blaugrana ace joins the club then he will be even further from the starting XI, especially after Memphis Depay was signed earlier in the summer.
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This means a loan deal could appeal to both club and player, with valuable Premier League experience perhaps enough to help him make an impact with United on his return. Jonny Evans and Danny Welbeck have already shown the good that can come from a loan to the Stadium of Light, leaving only to come back and feature heavily for the Red Devils.
Aston Villa and Everton are also interested in the winger, who will only depart if Pedro finally completes his move. A £22 million fee has been quoted as enough to sign the Spain international by the Daily Mail, and he could be the perfect replacement for Angel Di Maria.