Alberto was on the scoresheet on Friday night.
"This season, it was a bit more important than usual, because we weren't doing as well in Serie A as we wanted," the Spaniard told Sky Sport Italia.
“The last three or four games have been much better, we improved a great deal, and we confirmed that in the derby. We showed a winning mentality and want to keep this momentum going.
“At times we can play better or worse, but the important thing is to win. We cannot lose our concentration against the smaller clubs, because that is where we've dropped points and need to do better. We cannot afford that in Serie A."