A 19-man MLS Generation adidas squad are in Spain for training and friendlies against top Spanish clubs.
"It's a great opportunity playing against the reserve team for Real Madrid. It's one of the top teams in the world," said Mwanga. "I'm pretty sure there's gonna be a lot of things we're gonna learn from playing against them. European soccer - it's a different style from MLS. We're gonna learn some of things they do, even if it's a friendly game."
Portland Timbers recruit Jeremy Hall agreed with Mwanga's sentiments: "We're going to get some good competition and we'll learn stuff from the players we're playing against.
"These kids have been with the club since they were maybe 10- or 11-years old," Hall added. "They play the same style and all these kids are good."