"I give myself eight out of ten, but it would have been more if I had been able to score against Arsenal," said the 18-year-old. "I promise the fans that I will take Milan to fourth place. I am very happy here, as I have the most enjoyable job in the world."
Pato is famed for always scoring on his debut - doing so for Milan, the Brazil youth team and earlier this week the senior Selecao squad too.
"I hope to keep that trend up and score in my first derby!" he told the Gazzetta dello Sport.