Luis Diaz is being linked with a move to Manchester United as Ralf Rangnick looks to strengthen his squad before the transfer window slams shut.
The Colombian attacker is reportedly a target for a number of top clubs this month, and United are said to be just one of the 25-year-old's many admirers.
United were rumoured to be one of the teams that sent scouts to watch Diaz play last weekend amid growing speculation linking the Porto winger with a move to Old Trafford.