The 28-year-old has been desperate to leave the London club for several seasons and this summer is no exception.
Zaha has two years remaining on his contract and is wanted by several Premier League sides.
Per the Manchester Evening News, United have a 25% sell-on fee that they are due if Palace sell Zaha to any club.
If he went for £40 million, United would get £10 million of that fee.
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