Immobile struck in the battling 2-1 win.
He said later, “We put in a great Champions League performance midweek and that used up a lot of energy, but we needed the points in Serie A too, so it was a tough slog.
“I am happy that my goals help the team, I always want to do better and keep improving. We've seen how wonderful it is to play in Europe and want to do it again next season. It takes energy away, both mental and physical, but we've got a large squad and must use it to the full."