Rafa Benitez has explained his decision to take Victor Fernandez with him to Spain.
Fernandez was in included in Benitez's squad for the club's four-day training camp.
And the 19-year-old winger could be involved in Sunday's friendly against Royal Antwerp at the Pinatar Arena.
Fernandez and goalkeeper Nathan Harker, also 19, took part in today's double session ahead of the game.
Benitez decided to call upon Fernandez, signed from UE Cornella Youth just over a year ago, after speaking to Under-23s coach Ben Dawson.
Asked about Fernandez, United manager Benitez said: "We have some young players coming with us during the season.
"Here, we needed to bring a couple of them. We were talking with Ben. He (Fernandez) can play in three for four positions, so he was a good option. He's doing well, he's training well.
"The young players are shy at the beginning, but little by little, they are giving us what we are expecting from them."