The forward has been a bit-part member of David Moyes's first team this season, making just four Premier League appearances, though he has scored three goals in two Capital One Cup outings.
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"Javier is my good friend and I hope he gets lots of chances this season at Manchester United," he told The People.
"He is one of the best finishers in England and deserves chances under the new coach.
"If he plays regularly, he will score, so I don't totally understand why a player of his quality has not played more games.
"If he doesn't play regularly he will need to think about leaving. You always want to succeed at the biggest clubs but, if he is not given the chance, there will be big teams in England and Europe wanting him."