And, during the second half at the Allianz Arena, the United manager brought on academy prospects James Garner, Axel Tuanzebe, Tahith Chong and Demetri Mitchell to take on experienced internationals such as Robert Lewandowski and Arjen Robben.
"Finally, it's over. Finally, such a difficult pre-season is over," Mourinho told MUTV.
"The players were, once more, brilliant. They could not have done better than what they did, fantastic experience for the boys.
"There was a moment I was looking to the area and there was Axel at centre-back to left, Demetri at left wing-back, Garner in midfield on the left and Chong.
"At the same time it was Lewandowski on Axel, Robben on Mitchell, (Leon) Goretzka on Garner and (Niklas) Sule on Chong.
"It was fantastic, absolutely fantastic.
"We were playing against their best team, it was their complete squad apart from (Corentin) Tolisso."
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