( CNN ) -- Former Italian Prime Minister Silvio Berlusconi is facing yet another corruption charge . A preliminary indictment by a judge in Naples alleges that the 77-year-old bribed a senator to change sides and supported his party in 2006 , Berlusconi 's lawyer said Wednesday . Sen. Sergio De Gregorio 's change of allegiance eventually helped bring down the center-left government of Romano Prodi in 2008 , paving the way for Beruslconi to become prime minster for a third time . The senator is cooperating with prosecutors and a first court hearing is scheduled in Naples for February 11 . Berlusconi says he is innocent , according to his lawyer , Michele Cerabona . The former Prime Minister has been the subject of multiple corruption and bribery charges over the years . In August , Italy 's high court upheld a four-year prison sentence for tax fraud , and this month , a lower court ruled that Berlusconi should be banned from public office for two years . Because of his age , it 's unlikely Berlusconi will spend any time in prison . Silvio Berlusconi , so long ! Berlusconi gets 7 years in underage sex case . CNN 's Hada Messia and Susanna Capelouto contributed to this report .
A judge in Naples indicts Michele Cerabona , accused of bribing a senator to switch sides . The former Italian Prime Minister says he did n't do anything wrong . Trial is set to start in four-year in Italy .