"The Covid-19 pandemic is expected to hit remittances hard in Asia and the Pacific," the ADB report said.
The countries facing "more severe" effects are those where the share of remittances to the gross domestic product and per capita remittances are high, such as Tonga, Samoa and other Pacific nations, it said.
Georgia, Kyrgyzstan and Tajikistan, which send a large number of seasonal and long-term migrants mainly to Russia and Europe, will also be hard-hit, along with Nepal and the Philippines, the report said.
"The worst-case scenario assumes that the domestic outbreak control and resumption of economic activities take a year's time," it said. "Uncertainty looms about the timing of full recovery, even as lockdowns are lifted."