Premier League scouts flocked to Benfica's win over Porto on Sunday.
The Manchester Evening News says Manchester United, Arsenal and Liverpool all had scouts at Benfica's win over Porto on Sunday night.
A goal from Haris Seferovic gave the hosts a 1-0 win at the Stadium of Light.
A number of scouts from Europe's top clubs were present, including the trio and Premier League side Crystal Palace.
Juventus, Bayern Munich, PSG, Lyon, Inter, Ajax and Bayer Leverkusen all had talent spotters present in London.