Victor Osimhen scored the only goal of the game on Sunday.
“I don't like this talk of Scudetto and us having to kill teams off easily. Calm down. We are a strong team who can run into difficulty when we only play one half well," Gattuso told Sky Sport Italia.
“This is a team that needs to be kept on their toes and at times, we still have some off days. When we get hammered, we need to react straight away."
Alex Meret managed to keep a clean sheet on the day.
Gattuso added: “Meret has improved a great deal in the way he plays out from the back, so they may well get 30-35 games each per season. I choose based on how the opposition tries to attack us."