Greenwood has been superb on-loan with Getafe this season.
Getafe president ngel Torres recently revealed that Barcelona have inquired about Greenwood.
Now Marca says Bara, Atletico Madrid and Juventus are eyeing the 22-year-old.
But there is also strong interest from Saudi clubs and United hope to sell to the highest bidder.
The English giants hope to raise 60m from Greenwood's sale.
It is a sum neither Bara, Atletico nor Juve would be ready to pay. That means United could push the player to accept a move to Saudi Arabia.