Portuguese publication A Bola claims a United representative watched the 22-year-old in action in Braga’s 3-3 draw with Vitoria SC.
The young winger has also been linked with the likes of West Ham, Porto, Barcelona, Atletico Madrid and Monaco.
Silva has a £15.5million release clause in his contract which expires in 2019.
He revealed earlier this month that he turned down offers in January: “I’ve received some offers but I preferred to stay here. My goal is to give everything for this club.”
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?