Boca are one of the most successful sides not just in Argentina but the whole of South America. They have been Argentine champions 33 times, bettered only by historic rivals River Plate with 36, and won the Copa Libertadores six times, just once less than fellow-Argentines Independiente, who lead with seven.
"My aim is the same as Boca's ... to win the Libertadores, win the league. From what I've heard it's to win everything," said De Rossi, who helped Italy claim the 2006 World Cup during a 117-cap career.
While many former Boca players – such as Diego Maradona, Walter Samuel and Carlos Tevez -– have gone on to enjoy successful careers in Italy, De Rossi is the first major Italian star to play for the Buenos Aires outfit.
De Rossi said he was looking forward to playing in "a stimulating atmosphere, because that stimulus is the most important thing for me since I live football 24 hours a day. It's like it devours me, it eats me up: I don't want somewhere that will turn me off."
The Italian said he had trained hard since being let go by his hometown club, but said he would likely need between one week and 10 days of training in order to be fully fit for selection.
"That is going to be decided by the coach," he said, referring to Gustavo Alfaro. "I will be here for a year, I would have played yesterday [Sunday]."