Newcastle United and Norwich City were among the clubs who paid a visit to Estádio do Dragão on Monday night.
Scouts from both English sides were present to watch Porto’s league game against Nacional, according to Portuguese newspaper O Jogo.
The outlet doesn’t seem to know who the emissaries had an eye on.
Although the Canaries don’t always have a scout in Portugal, Newcastle are frequently mentioned in these lists published by newspapers, especially at Porto matches, and should have a specific target at at the club.
Porto beat Nacional with a 3-1 scoreline, and keep themselves on top of the Portuguese League, six points clear from Braga, who are in second place.
For the away side, only midfielder Aleksandar Palocevic had a really good performance.
With Herrera and Brahimi having their contracts expire at the end of the season, they are definitely a duo to keep an eye on.
Scouts from Manchester United, Everton, Atletico Madrid, Sevilla, Villarreal, Bordeaux, Montpellier and Eintracht Frankfurt all attended the game as well.