As a politician, Kavelashvili is known for his anti-US rhetoric and in 2022 he founded People’s Power, his own right-wing Eurosceptic party.
He accused Zourabichvili of “abusing” her powers as president by becoming an opposition figurehead.
“My priority is to return the presidential institute under the constitution,” he said.
In Georgia, the president represents Georgia on foreign trips but can challenge parliamentary legislation.
Georgia, a former Soviet state in the South Caucasus, has become an ideological battleground between the Kremlin and the West and has been in turmoil for much of the year.
The pro-West opposition described parliamentary elections won by the Georgian Dream government in October as rigged by the Kremlin and has demanded a rerun.
European election observers said it was marred by widespread instances of bribery, double voting and physical intimidation.
The country has been embroiled in protests ever since, with the opposition boycotting parliament.
The European Union has also suspended Georgia’s accession to the bloc because of its shift towards the Kremlin and its similar crackdown on freedom of speech and LGBTQ+ rights.
Kavelashvili will become the second former Georgian international footballer to hold high office in his homeland.
Kakha Kaladze is the current Georgian Dream mayor of the capital, Tbilisi. He played for AC Milan for nine years and Georgia for 15 years.
Critics have accused Georgian Dream – established by Ivanishvili, who made his billions in Russia – of becoming increasingly authoritarian and tilted toward Moscow, accusations the ruling party has denied. The party recently pushed through laws similar to those used by the Kremlin to crack down on freedom of speech and LGBTQ+ rights.
Zourabichvili has been president since 2018 and has vowed to stay on after her six-year term ends on Monday, describing herself as the only legitimate leader until a new election is held.
Georgian Dream’s decision last month to suspend talks on their country’s bid to join the EU added to the opposition’s outrage and galvanised protests.