Sanchez has endured a difficult 19 months at Old Trafford after moving from Arsenal in January 2018.
Ole Gunnar Solskjaer has not included the Chile international in his plans for the season ahead, paving the way for his departure.
Sanchez is now back in training at United following his involvement in the Copa America this summer.
However, the Red Devils expect the forward to seal a move away in the coming weeks.
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