He was responding to questions on the debt being accumulated by countries under China's BRI.
Gaspar said the BRI had his support because such public investments were very important in many countries.
"..it (BRI) is a very ambitious one that promises to increase public investment in an ample set of countries. Increasing public investment, if it is productive, is very important in many countries. As such that is something that deserves to be supported, he said," he said.
The BRI focuses on improving connectivity and cooperation among Asian countries, Africa, China and Europe
Gasper said public investment contributes to fiscal sustainability if the investment is efficient and productive.
"And in order to have that, it is very important -- in many countries -- to upgrade their public investment management systems," he said.
"The IMF has been engaging over the years in capacity development in many countries, precisely to contribute to have the right conditions in place," Gasper said.
Unexpected rise in inflation could unleash financial turmoil
IMF on Wednesday warned that an unexpected rise in the US inflation, resulting from the aggressive fiscal stimulus launched by President Donald Trump, would cause significant global financial tensions forcing central banks around the world to respond firmly.
"Financial vulnerabilities, which have accumulated during years of extremely low rates and volatility, could make the road ahead bumpy and could put growth at risk," the IMF said in its "Global Financial Stability Report" issued twice a year.
The IMF also said that a hike in inflation in the US could lead the Federal Reserve to raise interest rates faster than has been expected to date, Efe reported.
"What we are flagging is that at some point markets see shocks in inflation that raise inflation uncertainty and when that happens, that is associated with a rise in long-term interest rates and that might lead to a tightening in financial conditions," said Tobias Adrian, the director for the IMF's monetary and capital markets department.
The so-called "emerging markets" would be particularly vulnerable to "spillovers" if that happens, the report warned, and Adrian said that central banks could respond to any unforeseen hike in US inflation by reacting more firmly than expected.
Last December, the US Congress approved an aggressive plan of tax cuts for corporations and, to a lesser degree, for the general public, to which shortly thereafter a budget bill that significantly raised defense spending was added.
In addition, the Trump administration is pushing a costly plan of infrastructure investments in Congress.
India using 'right policies' to lower high debt level: IMF
India has "quite a high" debt to GDP ratio, but New Delhi is trying to lower it using "the right policies", the International Monetary Fund has said.
India's general government debt remained relatively high, at 70 per cent of the GDP in 2017, Abdel Senhadji, Deputy Director, IMF Fiscal Affairs Department, told reporters at a news
"The debt level is relatively high (in India), but the authorities are planning to bring it down over the medium term with the right policies," Senhadji said.
In fiscal year 2017-18, India is planning to continue with the consolidation in the current fiscal year and over the medium term, the top IMF official said.
"They are, in fact, targeting their federal deficit of three percent over the medium term, and they are targeting also a debt ratio of 40 per cent over the medium term at the federal level, which corresponds to about 60 per cent at the general government level. And we believe that those targets are appropriate," the IMF official said.