The Brazilian striker said: "It's been very beautiful, I am very happy for my family who are in Milan. Playing here is a dream, before the game I was calm thanks also to my fellow teammates and coach (Carlo) Ancelotti, who told me to stay calm and play football like I do."
Milan vice-president Adriano Galliani said: "Pato is a young man with a long time to improve. He is one more player of Milan.
"Let's reign in the hype. Milan were great without Pato and will be great with him."