In 2014, Robinho issued a statement through lawyers denying the allegations.
The 33-year-old is now playing for Atletico Mineiro in Brazil.
Former Manchester City football star Robinho has reportedly been sentenced to nine years in prison for rape by a Milan court.
A statement on his Instagram page on Thursday night said that he had "already defended himself against the charges, maintaining that he played no part in the incident".
Reports in Italy claim the former Manchester City and Real Madrid star, along with five others, was implicated for an attack on an Albanian girl in a Milan nightclub in January 2013.
"All legal provisions are being taken on this first decision".
The complex nature of the Italian judicial system means that there are various appeal processes available to Robinho and his legal team so it may take a while before any sentence is carried through.
According to local legislation no Brazilian citizen can be extradited to another country under request to face criminal charges, although that will not apply should he leave his home nation and is detained elsewhere.
As Robinho is a Brazilian national now residing in his home country, however, he is highly unlikely to face jail time for his offences.
The Brazilian player was one of the most sought-after in 2005 when he made his big-money move from Santos to Real Madrid. He is now with Atletico Mineiro and made his last appearance for the national team against Colombia in January.