According to Italian daily "La Stamapa", a tribunal presided over by magistrate Mariolina Panasiti passed the verdict on Thursday.
Under Italian law he won't be sentenced until the appeals process has been finalised - which could take years.
Agent and lawyer Marisa Alija Ramos posted on Instagram to state Robinho denies the charges after pleading not guilty on behalf of her client, who did not attend the court hearings in northern Italy. Robinho affirms that he had nothing to do with the incident referred to.
The Brazilian star had previously been accused of sexual assault while at City in 2009, but was later cleared of the charges.
Manchester City bought Robinho for £32.5m in 2008. Reuters
Former Real Madrid and Manchester City star Robinho is now playing in his homeland for Atletico Mineiro.
It added: "All legal steps are now being taken with regards to this decision by a court of first instance". However, Brazil does not allow for the extradition of its own citizens, meaning he would only risk arrest and deportation if he was stopped in a third country.
Robinho moved to Europe amid much hype in 2005 when he joined Real Madrid from Santos. Robinho joined Atletico Mineiro from Guangzhou Evergrande past year. He has 100 worldwide caps for his country.
Robinho played over 40 games for Manchester City between 2008 and 2010 after signing from Real Madrid.
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