In 2014, Robinho issued a statement through lawyers denying the allegations.
The forward, 33, has reportedly been found guilty of sexual assault while at a Milan disco on January 22, 2013.
The Brazilian has been found guilty of a 2013 gang-rape of a 22-year-old Albanian woman in a Milan nightclub, according to Sky Italia.
Robinho was playing for the Rossoneri at the time.
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".
Robinho had previously been accused of sexual assault during his City days, but was ultimately cleared of any wrongdoing.
"All legal steps are already being taken regarding this decision in the first instance". Brazil does not extradite its own citizens when they are sentenced in other countries.
That sparkling form led him to Real Madrid, where he starred for three seasons before earning a lucrative move to Manchester City in 2008.
However, he struggled to adapt to the Premier League and was sold to AC Milan for just £15m two years later after a loan spell at his hometown club Santos.
Robino played at AC Milan later after 16 months where he won the Serie A title with players like Zlatan Ibrahimovic and Antonio Cassano.
He's been with Atletico Mineiro since February of a year ago.