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Liverpool raided Porto for Luis Diaz in January and were back watching the Portuguese side on another scouting mission this week.

The Reds sent scouts to the Estadio do Pragao for Wednesday night's Europa League clash.

Porto were undone by Lyon, who now hold an advantage ahead of the return leg, which meant few of their current stars were able to impress.

The Portugal outfit have long been an impressive breeding ground for players, especially those from South America.

Clubs have captured the likes of Radamel Falcao and James Rodriguez from Porto and Liverpool are exercising the possibility of doing so again.

Manchester United also had representatives in the stands as they kept their eye on any possible targets whilst German giants Bayern Munich also had onlookers present, According to newspaper O Jogo.

Midfielder Vitinha was a bright spark on the night as the hosts were beaten. Porto currently sit top of the league with Mehdi Taremi their top goalscorer following Diaz's departure.

Liverpool have been able to impressively transition their forward line in the past 18 months.

Previously Mo Salah, Sadio Mane and Roberto Firmino looked undroppable and questions were asked as to how Jurgen Klopp would rebuild once any of