Mata wrote in his personal blog: "Facing the current champions and getting such a win, feeling how the fans celebrate it, and enjoying on the pitch have been enough reasons to make this weekend special.
"Each goal came in a different way; we showed that we are a team with a lot of potential, with different ways to score goals, and we have to take advantage of that. The crowd in Old Trafford was really excited, in a way I hadn't seen for a long time, and that's what our fans deserve.
"Being able to play and win like that is a special feeling. You can feel the crowd connecting with the team, and it seems that everything just flows. In general we got very positive feelings and a boost of confidence to play the next couple of games before another international break."