A Milan court ruled that Robinho and five other Brazilians assaulted the woman, who was 22 at the time, after plying her with alcohol in a discotheque.
Former Milan and Manchester City striker Robinho has been found guilty of rape in a Milanese disco in 2013 and given a nine-year sentence.
However, Robinho, who now plays for Atletico Mineiro in the Brazilian league, has the opportunity to appeal the verdict under Italian law.
Robinho, who was part of the Milan squad at the time, had strenuously denied the charges.
The sentence will not begin until after Robinho has appealed the verdict.
The Brazilian player was one of the most sought-after in 2005 when he made his big-money move from Santos to Real Madrid.
Robino played at AC Milan later after 16 months where he won the Serie A title with players like Zlatan Ibrahimovic and Antonio Cassano. The whereabouts of Robinho's five companions is not known, so their trial has been put on hold.
Robinho managed just 10 appearances for the Chinese Super League outfit though before joining Atletico Miner past year.