A 64-year-old Indonesian man in Singapore has been diagnosed with COVID-19, but it is likely he contracted the virus outside of the island nation, the Indonesian embassy has stated, confirming an earlier announcement from the Singaporean government.

The Singapore Ministry of Health announced on Sunday that the man, identified as Case 147, had just arrived in the city-state on Saturday and tested positive for the virus on Sunday.

"It is not yet known how the Indonesian citizen contracted the COVID-19 [virus], but the Singapore Ministry of Health has said that this case is an imported case, meaning that the [man] is likely to have been infected before [arriving in] Singapore," the embassy said in a statement on Monday.

The embassy also said it would be monitoring the situation closely and coordinate with the relevant local authorities on all matters regarding the patient.

Case 147 is the third Indonesian to be diagnosed with COVID-19 in Singapore.

The first Indonesian case is a 44-year-old domestic worker whose test results came back positive on Feb. 4, along with the positive test results of her employer, a Singaporean national. The woman has since recovered and has been discharged from hospital.

The second case is a 62-year-old woman who entered Singapore on a social visit permit and had no travel history to countries or territories affected by COVID-19. She tested positive on March 6.

As of Monday, 13 Indonesians overseas had been diagnosed with COVID-19: nine Diamond Princess crewmen in Japan, three in Singapore and one in Taiwan. Seven have recovered from the disease.