Manchester United reportedly sent a scout to watch Rafa Silva in action for Brags against Vitoria SC Sunday night.
 The winger has been linked with a host of clubs in recent months, including Barcelon,Atletico Madrid, West Ham United and Monaco.
 However,the Red Devils have now entered the race to sign the Portugal international, according to A Bola.
 The report adds that United are likely to speed up their pursuit if Jose Mourinho takes charge  of the club in the summer.
 It is believed that Silva has a £15.4m release clause in his contract,which is due to expire in 2019.