Greek Prime Minister Kyriakos Mitsotakis is expected to announce at noon on Thursday a one-month nationwide lockdown in a bid to curb a resurgence in COVID-19 cases.
Greece has reported fewer cases than most European countries but the number of infections has been gradually increasing since early October, prompting it to re-impose restrictions.
It registered 2,646 cases of the novel coronavirus on Wednesday, the highest daily tally since its first case emerged in February, health ministry data showed.
Earlier this week the country expanded a night curfew and shut restaurants, bars, theatres and museums in the most populous areas of the country for one month.
Some regions, mainly in northern Greece including Salonika and Serres, have already entered a lockdown.
The fresh record brings the total number of infections to 46,892. Greece reported 18 deaths from the virus on Wednesday, bringing the total to 673.