Man United defender Alvaro Fernandez, who is on the pre-season tour after spending last season on loan at Preston, said: "Mason Mount has surprised me because he was not a player that stood out to me before when watching matches.
"But in training, you can see the quality, the technique and the ability that he has. He is very good.
"The coach is changing the team. New signings have arrived and the squad now has a new lease of life.
"Mason is a really great player, but on the pitch, he has an incredible character. And then there is Lisandro Martinez, who arrived last summer and has a level of aggression that seems crazy."
United enjoyed an encouraging first season under Erik ten Hag, finishing third in the Premier League and winning the League Cup.
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