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United though are in a race against time to complete the move by midday and have Sanchez registered to play Burnley.
Sanchez will take the No 7 at Old Trafford and adidas have already started selling shirts with his name on in London.
Ed Woodward made signing an iconic superstar to wear the No 7 one of his priorities when he first joined the club and is finally getting his man.
United have also looked at Antoine Griezmann and Paulo Dybala but have swooped in to get Sanchez ahead of rivals Manchester City.