Confidence votes on the Berlusconi-led government are scheduled for 14 December in the Italian Senate and House of Deputies.
"I have to carry on," he said on Tuesday, speaking at a meeting of his People of Liberty party in the northern Emilia Romagna region.
"I will win the confidence votes in the lower house of parliament and the senate," he stated.
The government has been edging ever-closer to collapse since Berlusconi's key former ally, Gianfranco Fini broke away from the 74-year-old prime minister in July and deprived him of a safe majority in the lower house of parliament.
Opposition politicians and people close to Fini have demanded the premier step down amid a series of fresh scandals that have tarnished the government's image.
Berlusconi has been linked to a prostitute and a teenage nightclub dancer who says she attended after-dinner sex games at his villa in Arcore, near Milan. The 74-year-old premier was earlier linked to a teenage underwear model and another prostitute.
The government has also come under pressure over its handling of Italy's ailing economy and controversial legislation critics say is aimed at saving Berlusconi from prosecution for corruption and tax fraud.
Berlusconi has said he supports snap elections if he is pushed out of office.