The Red Devils managed to see off competition from defending Premier League champions Manchester City to sign Sanchez in January.
The 29-year-old made a slow start to his Old Trafford career following a return of three goals in his opening 18 games for the Red Devils.
Sanchez’s poor form has rumbled on into the new season and the Chile international has failed to score in his last five games.
The former FC Barcelona forward scored 80 goals in 166 games during three and a half seasons at Arsenal.
Sanchez established himself as one of the best players in the Premier League during his spell at the north London side.
Former Chelsea FC striker Sutton is hoping that Sanchez can recover his best form after a slow start.
“I hope he turns it around,” Sutton told BBC Radio 5 Live. “I don’t care about the money. He is a player who gives it all. He does care.”
Manchester United finished in second spot in the Premier League table last term but ended the campaign without silverware.
The Red Devils lost to Championship side Derby County on penalties in the League Cup third round on Tuesday night.
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