Porto midfield schemer Fabio Vieira is being watched by Manchester United.
The 21-year-old has had a standout season for the Portuguese side, with nine assists in 21 appearances.
Record says United are one of ten European giants looking to sign Vieira - with Ralf Rangnick keen to seal his first transfer.
Any move made by United could prompt any of Atletico Madrid, Borussia Dortmund, Saint-Étienne, Real Sociedad, Sassuolo, Rennes or Nimes to launch a bid.
The report also states that United could face a challenge from Vieira's homeland too, with Braga and Salgueiros also interested in acquiring his services.
If a deal for Vieira is completed in January, he could be a potential replacement for wantaway star Jesse Lingard.
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