Keep in mind that, as in real football, the statistics are directly influenced by the role of the player. If your Goalkeeper has a few zeros in his performance (e.g. Goals, Assists, Key Passes) that is expected. On the other hand, if your Goalkeeper has some numbers on the sheet that are linked to action unusual for the GK role it can be a one-time exception or some of your players were missing from the pitch (due to suspension or injury) and the GK was just filling in.