Preston manager Ryan Lowe says Manchester United are delighted with the progress of Alvaro Fernandez.
The wing-back has shone on-loan at Deepdale this season.
Lowe said: "In terms of the games he's played for us and the minutes he's played, I know Man United are absolutely over the moon with it. Because he is a good player, but he's still young and nave.
"We still have to tactically tell him what to do and what not to do. His awareness, defending, has got a lot better and it's a learning process for Alvaro. When he plays and performs the way he can, he's a very good player.
"The rotation we have, with him and Robbie - we have a youngster who can be on the front foot and then a bit more experience defensively and offensively. So, it's a good battle between the two of them and we feel either can do the job required."