The 22-year-old spent last season on loan at Getafe.
He impressed in his first season since returning to football after not playing for 20 months.
Greenwood scored 10 goals and assisted six in 36 games for Getafe, with the Spanish club keen on keeping him.
But Manchester United have supposedly slapped a £40million price tag on him amid interest from top sides like Napoli, Barcelona and Borussia Dortmund.
And it’s Juventus who are now reportedly leading the race to sign him this summer.
THIS IS A DEVELOPING STORY..
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