According to reports in Portuguese media outlet O Jogo, via Sport Witness, a Southampton scout attended the match between FC Porto and Vitoria Setubal on Sunday night.

Who could they have been watching, then?

Well, it was almost certainly someone from the hosts Porto, who definitely have a number of players that Southampton would dream of signing, such as Andre Silva and Yacine Brahimi.

However, those two are likely to be out of the south coast club’s reach – and wage budget – but they could be looking at a highly-rated midfielder instead - Danilo Pereira.

Who?

Britain Soccer Football - Leicester City v FC Porto - UEFA Champions League Group Stage - Group G - King Power Stadium, Leicester, England - 27/9/16
Leicester City's Marc Albrighton in action with FC Porto's Danilo Pereira 
Action Images via Reuters / Carl Recine
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The 25-year-old defensive midfielder is understood to have impressed a number of clubs with his dominant performances in the middle of the park for the Portuguese giants this season, and Saints may well be taking a closer look at the Portugal international.

Where would he fit in?

Recently, Claude Puel has deployed a 4-2-3-1 formation with Steven Davis sitting deeper in a role alongside Oriol Romeu, but he certainly hasn’t looked comfortable there.

Signing Danilo would go some way to solving that issue, but they could face competition for his signature from some of their Premier League rivals.

Who else has been linked, then?

Liverpool and Manchester United were both linked with the midfielder by A Bola earlier this month, but whether he would get regular first team football at those clubs remains to be seen.

Saints also have a potential trick up their sleeve by the fact they already have Danilo’s Portugal international teammate Cedric Soares in their ranks, who could help persuade the 25-year-old to make the move to St Mary’s.

How much would he cost?

This could be a sticking point. The Guinea-Bissau born player only recently signed a new contract at the Estadio do Dragao with a release clause of €60m, but we already know that players rarely go for anything near that price.