Two Indonesians have tested positive for novel coronavirus after coming into contact with an infected Japanese national, President Joko Widodo said on Monday.

A 64-year-old woman and her 31-year-old daughter had become infected after contact with a female Japanese visitor, who lived in Malaysia and had tested positive after returning from a trip to Indonesia, Widodo told reporters at the presidential palace.

"After checks, they were in a sick state. This morning I got a report that the mother and the daughter tested positive for coronavirus," he said. The two patients were being treated at Jakarta's Sulianti Saroso infectious diseases hospital.