Manchester United are ready to return to Benfica for another defensive signing.

Having swooped for Victor Lindelof 18 months ago, United are now eyeing another Benfica defender for this season's winter market.

O Jogo says United and Lyon had scouts in the stands on Sunday to see Benfica defeat Porto, where Haris Seferovic hit the winner.

The subject of their attention was Ruben Dias, 21.

The centre-half, a Portugal international, came through the youth system at Benfica and has a deal 2023.