Reports are out claiming that Porto star Yacine Brahimi is being linked with Manchester United.
The Daily Mail reported that United were among clubs represented as Porto beat Vitoria Setubal 2-0 on Sunday.
Tottenham and Monaco also had scouts in the crowd.
Porto winger Yacine Brahimi and coveted 18-year-old midfielder Ruben Neves are among the players of interest but both came off, Neves at half-time.
Arsenal are also said to be interested in signing the FC Porto pair.