Takehiko Nakao's comments came after Washington softened its opposition to the Chinese-proposed Asian Infrastructure Investment Bank and suggested it work together with existing entities such the World Bank.
The Manila-based ADB is ready to collaborate with the AIIB if it meets environmental, social and other standards for lending, Nakao said in an interview ahead of today's release of his bank's regional economic outlook.
US officials worry the bank might become an instrument of Chinese foreign policy and undermine the World Bank or other institutions by offering credit with few conditions.
China proposed the bank in 2013 to finance construction of roads, ports and other infrastructure. It has pledged to put up most of its initial USD 50 billion in capital.
Britain broke with Washington last week to announce it wanted to join the Chinese-led bank. France, Germany and Switzerland followed.
The ADB has talked with Chinese officials to share its "knowledge and experience" based on its 50-year history and staff of some 3,000 throughout the region, said Nakao, a former deputy Japanese finance minister.
In its economic outlook, the ADB said this year's overall growth in developing Asia-Pacific countries should hold steady at last year's 6.3 per cent.
Growth in India, the region's other economic giant, should accelerate to 7.8 per cent from last year's 7.4 per cent following regulatory changes aimed at removing "structural bottlenecks," the bank said. It said that should rise further to 8.2 per cent next year.
The ADB says developing Asia-Pacific economies need some USD 7 trillion in investment in roads, ports and other infrastructure in the decade through 2020.
"The US would welcome new multilateral institutions that strengthen the international financial architecture," the official, Nathan Sheets, was quoted as saying.
