Speaking to BT Sport, the Portuguese defender said that he is pleased to be returning to Manchester with three points.
"It was very good. The team have helped me and prepared me for this. I am happy for the debut and for the win. That is most important. I think it was a good win," the youngster said.
"Most of the Young Boys team is used to playing on this pitch. We are not. It was tough but we needed to be prepared for that."
United's next Champions League game is against Valencia on October 2.