Manchester United boss Jose Mourinho was happy to involve Joe Garner and Mason Greenwood in last week's Champions League defeat at Valencia.
The two teens were involved in the traveling party.
Mourinho said, "I think it's always a nice experience for them even if they don't play, to be involved, to feel a new habitat and, I think, to even feel the pressure of being on the bench and thinking 'maybe I have to play'.
"To feel that extra adrenalin and responsibility, I think it's always a good experience for them. But they had pre-season with us, they trained with us many, many times. Last week they were training with us almost every day, so it's not really something new for the boys."