ARSENAL reportedly checked out Andrija Zivkovic in Porto's 1-0 win at Benfica.
A host of Premier League clubs had representatives looking at targets in Sunday's top-of-the-table Primeira Liga clash.
Manchester United, Everton, Leicester, Liverpool, West Ham, Tottenham, Aston Villa, Southampton and Swansea all had scouts at the game.
And Portuguese title O Jogo say that the Gunners scout was taking a closer look at Benfica's Serbian winger Andrija Zivkovic.
The tricky international joined from Partizan in 2016 and has made himself a regular starter in the Eagles' side this season.
O Jogo claim that West Ham were present at the game to watch Benfica's Mexican striker Raul Jiminez.
Benfica full-back Andre Almeida was apparently being watched by Leicester, with Everton taking notes on Porto striker Moussa Marega.
Spurs were said to been scouting Porto's Ricardo Pereira during the clash.
Hector Herrera's strike won the game in the 90th minute as Porto hurdled Benfica to move two points clear at the top of the table.