Sanchez is not in Ole Gunnar Solskjaer's plans for the 2019/20 campaign and is free to leave Old Trafford.
Inter have emerged as leading candidates for his signature, with the European transfer window open until September 2.
However, Antonio Conte's side are only willing to pay a £4.5m of the Chile international's wages.
That would leave United to make up the shortfall, which could result in them spending £12m on a player plying his trade for another club.
Sanchez has endured a nightmare spell at Old Trafford, scoring just five goals in 45 appearances.
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