European Union governments will spend the next six weeks putting together a firewall to protect their fragile banking systems against what is now seen as an inevitable Greek default.
G20 sources said up to 50 per cent was likely to be wiped off the face value of Greece's €350 billion ($608 billion) debt - but not until Europe had put into place a war chest to prevent the contagion spreading.
More money will be disbursed by the International Monetary Fund and the EU next month to keep the Greek Government afloat, but this is seen as a short-term fix while Europe's leaders beef up the eurozone bailout fund, the European Financial Stability Facility (EFSF).
Europe came under ferocious pressure at this weekend's meeting of the IMF in Washington to contain the sovereign debt crisis, which is blamed for dragging the global economy to the brink of a double-dip recession.
The IMF is reportedly willing to continue bailing out Greece for the short-term, provided Europe uses the time to tackle the issue of debt once and for all.