The former striker tried to explain why the Chile international has failed to make an impact at Old Trafford following his arrival from Arsenal
Alexis Sanchez has struggled at Manchester United because he is not happy, according to former star Robin van Persie.
Sanchez has failed to live up to the hype since swapping Arsenal for Premier League rivals United in January 2018, scoring just five goals in 45 appearances.
Injuries have also hampered Chile international Sanchez, who managed only one league goal for the Red Devils last season.
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Van Persie also made the move from Arsenal to United in 2012-13, winning the Premier League in his first season at Old Trafford – the club have not topped the English summit since.