It was his 22nd goal for the season and leaves him ahead in the race for the Capocannoniere.
"Tomorrow I can sit back and relax watching the games. Unless Icardi gets a hat-trick, I'll be Capocannoniere again at the age of 38. That's pretty satisfying," Toni told Sky Sport Italia.
The striker turned 38 this week and is set to take the top scorer title nine years after the last.
"How old do I feel? 26. No, actually that's a bit low. Let's say 30. If I scored all these goals, it is thanks to the whole team. Rafael celebrated his penalty save on Carlos Tevez with me.
"It has been an extraordinary campaign for the side and not just for me. Tonight we can celebrate all together.
"If I win the Capocannoniere crown then I'll have to reward my teammates with a gift. I'll probably receive phone calls with suggestions!"