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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.