Ugarte was singled out for praise by manager Ruben Amorim after the 2-1 win on Saturday in New Jersey.
He told MUTV afterwards: "(Ruben) always says about the communication.
"Speak to everyone and work as a team and try to recover the ball as soon as possible. I think tonight, not only me, the team played really well."
Ugarte also said: "In the USA, there are a lot of United fans. We can see every day, in the hotel and the street.
"It is important to understand where we are. We are enjoying it but we have a lot of responsibility."
Meanwhile, manager Amorim said of his Uruguay midfielder: "The first thing is adaptation to a new team, a new country
"Sometimes, you just look inside of the pitch but, off the pitch, you can have some trouble sometimes.
"He is more adapted and then he needs more confidence, it's also my job. If you look last year, take Bruno (Fernandes), who is always confident and look at the team, and the performance of the team if he doesn't perform well.
"We can see today, when they are confident in their play, it seems like everyone can touch the ball and have confidence. it is more a team thing than individual."