Paolo Maldini has been named AC Milan's new technical director, while Zvonimir Boban has been appointed to the newly created role of chief football officer.
Milan icon Maldini replaces Leonardo in the post, with the Brazilian reported to be returning to a similar post at former club Paris Saint-Germain.
Boban, who played for the club between 1991 and 2001, has left FIFA - where he was the body's deputy secretary general - to return to Milan.
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Maldini previously worked as Milan's sporting strategy and development director but Ivan Gazidis, the club's chief executive, feels he is the right man to succeed Leonardo.