"This was my preferred destination. It's a great club and there are many of my fellow countrymen who will help me mature and grow," said Pato after signing a five-year contract.
"I will move to Italy to bring Internacional's name to the top. I joined this outfit when I was 11. I can remember looking at the Beira-Rio Stadium and being impressed by how big it was.
"I promised my father that I would one day score a goal for him and I am happy I fulfilled this dream.
"I have always tried to repay the supporters' affection and I will always have pleasant memories of this club."