The Brazil international has signed a three-year contract with the Giallorossi.
â€śI am convinced weâ€™ll have a great season. Iâ€™m happy with the warm welcome from the fans, as they were looking for me all over the city.
â€śI donâ€™t like making promises, but I know what I must do on the pitch and I say it will go well.â€ť
A statement from the club confirmed the contract will expire on June 30 2013 and is worth â‚¬5m per season, plus performance-related bonuses.
The return to Serie A is something few expected when he walked away from Inter in April 2009 while suffering from depression.
â€śThis is something I really care about and the reason I came back to Italy. I am here and must prove what I can do. I will do it.
â€śI am ready to take on Inter.â€ť