Balotelli travelled back to Italy with the Napoli team in the early hours of Thursday morning following Wednesday night's Champions League clash at the Etihad Stadium.
On Thursday at 15.30 local time he went to the Public Prosecutor's office to discuss a trip he took around a notorious Camorra stronghold in Naples called Scampia.
Balotelli is said to have been accompanied on his visit, in June last year, by suspected Camorra leader Marco Iorio, who has been arrested for money laundering, amongst others.
The 21-year-old forward previously claimed he did not know who Iorio was.
"I didn't know who those people were, that day in Naples there were always many people around me," said Balotelli back in June this year.