Manchester United manager Erik ten Hag has hinted that the club are keeping tabs on a former Red Devils player ahead of the January transfer window.
The Red Devils sold left-back Alvaro Fernandez to Benfica in deal reportedly worth £5 million.
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The full-back's form has reportedly caught they eye of Spanish giants Real Madrid, who are looking for a new left-back.
However, it seems the Red Devils are also keeping an eye on the 21-year-old as the club's current left-backs remain out injured.
"I think the process is perfect. We loaned him to Preston, he got back, then we loaned him to Granada, he didn't play so much there, and of course we, all the time, observed him and now we had the opportunity to sell him," Ten Hag said, as per United Focus.
"But we have a buy-back [clause] so we have control of the situation, I think that's what he needed. From Preston, then go to La Liga, go to Portugal [with Benfica], every time stepping up to a higher club and a better league.
"Now we have to see and assess the situation if he can be an option for us. But playing at Man United is not so easy, playing in the Premier League for Manchester United is not so easy.
"You need experience, also development. You get development from playing for better clubs and in better leagues."