Manchester United boss Jose Mourinho says he will continue to rotate his squad.
The Red Devils face Manchester City later on today as they continue their pre-season tour in the United States.
Striker Romelu Lukaku is expected to feature as he continues to settle down with his new team-mates.
"For me it is a competitive training session that you try to win but it is not the most important thing," Mourinho told reporters.
"We had two matches against MLS teams, now it is time to raise the level and now we get three of the best teams in Europe [City, Real Madrid, Barcelona].
"I don't know the way they will face the game, if they want to win the tournament, the derby, I don't know, but I know what I want – that is to give minutes to my players, to try to improve, to make mistakes, to repeat exercises from training, to stop those mistakes, to make the two new players try to understand the team-mates and for the team-mates to understand them.
"There is always a little bit of rivalry, a little bit of an extra ingredient, but for me it is a friendly. I am not going to jump to celebrate a goal, or cry after any goal we concede. It is preparation."
