A Lebanese judicial source on Friday confirmed Beirut had extradited an ally of Italy's former prime minister Silvio Berlusconi.
"Senator Marcello Dell'Utri was handed over to an Italian security delegation and left the country on board an Alitalia aircraft at 4:00 am (0100 GMT) following a presidential decree," the source told AFP.
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An official source confirmed Michel Sleiman had signed an extradition agreement with Italy hours before he left office at the end of his presidential mandate on May 25.
Dell'Utri was arrested in Beirut in mid-April on an Interpol warrant.
Italy's top court in May upheld a seven-year sentence against Dell'Utri, who was convicted of serving as a mediator between Berlusconi and the Sicilian mafia.