The striker scored to help Napoli come from a goal down to earn the points.
"This is a team of great players. Finally I scored, we brought home these three points that are fundamental and give us strength for the match on Thursday in Europa League," Petagna told Sky Italia.
"In the last two years I had scored 30 goals in Serie A, I always played, [Cristiano] Giuntoli has always believed in me and I knew that I would stay here because I think I have important qualities.
“I can improve again with these great players and this great coach."