Mata wrote for his personal blog: "After the international break, there is a game coming on Saturday that I'm sure many of you are waiting for: the Manchester derby.
"All of us are fully aware that this is a very special game, yet we have to understand that these are three points and don't get too crazy. Both teams have started the Premier League well and the expectations are high, as everybody can imagine.
"David De Gea and me have been joking with Nolito and [David] Silva in the last few days, although the truth is we are now focused on the games with the national team. After that, we will have plenty of time to think about this exciting derby."