The 43-year-old was issued with the lengthy suspension on Thursday after he was adjudged to have deliberately barged Alexandre Castro following a draw with Valenciennes
The sporting director is now forbidden from sitting on the bench, going into the referee's dressing room and attending league meetings, however he can go into the team's dressing room and can still negotiate transfers.
The ban will apply to domestic games and therefore will not affect Champions League encounters.
The Ligue 1 winners were also handed a three-point suspension, which will come into force at any stage next season should another of their club officials become embroiled in a similar case.
The former Brazil international, whose suspension started on May 8 and will end on February 8, 2014, appeared to barge referee Alexandre Castro in the tunnel at Parc de Princes on May 5.
Leonardo, 43, had pleaded his innocence throughout the investigation, but the Disciplinary Commitee have asserted that the former Milan coach acted intentionally and have subsequently issued the lengthy ban.
Leonardo is likely to appeal the decision.