Manchester United reportedly sent scouts to watch Porto winger Luis Diaz in action last week as the Red Devils weigh up a bid for the Colombian star.
Diaz has attracted the attention of a number of European clubs in recent months after a run of dazzling form for the Portuguese giants.
Liverpool were said to be very interested in the 25-year-old to bolster competition in their attacking ranks but the Reds are yet to make their move with Mo Salah and Sadio Mane now due back from the Africa Cup of Nations in a matter of weeks.