The Red Devils are eager to profit off the two English stars, who are enjoying good seasons away from the club.
Sancho has been at Borussia Dortmund since January, reaching the Champions League final.
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Meanwhile, Greenwood has been productive this season at Spanish side Getafe.
Per the Manchester Evening News, Dortmund do want to re-sign Sancho, but only for a lower fee.
Greenwood is wanted by several clubs, including Atletico Madrid, Barcelona, and two Premier League sides.