The former Argentine international signed a contract on Thursday that will see him belong to the club for the next four years.
In the press conference before his official presentation D'Alessandro explained that joining the club is a "step forward" in his career, and that he can't wait to get into action with his new club, after having watched them play from the stands in their last two league outings.
"Brazilian football, and Argentinian football are two of the best in the world," affirmed the player, who also stated that Internacional have a "very impressive infrastructure."
The former San Lorenzo and River Plate playmaker joined the club for $6.5 million, and will wear the club's no.99 jersey in celebration of their centenary year.
Internacional, who won the 2006 Copa Libertadores, are hoping to be a very competitive team this season and on Wednesday added Daniel Carvalho to their squad from CSKA Moscow.
At the moment they find themselves mid-table of the Brazilian league standings, eight points behind league leaders, Cruzeiro.