Portuguese President Marcelo Rebelo de Sousa (1st R) attends a memorial ceremony for the COVID-19 victims at the Belem Palace in Lisbon, Portugal, on Nov. 2, 2020. (Photo by Pedro Fiuza/Xinhua)

Portuguese President Marcelo Rebelo de Sousa tested positive for COVID-19, said a statement posted on the official website of the Portuguese Presidency on Monday night.

Rebelo de Sousa had "tested negative yesterday, and although today's antigen test is negative, it was now known, at 9:40 pm, that the PCR test was positive," the statement said, referring to the polymerase chain reaction (PCR) test.