IMF will refuse to join Greek bailout until debt relief demands are met

Fund official confirms it will not sign up to any formal support programme unless eurozone creditors reach 'explicit and concrete' agreement

The International Monetary Fund will refuse to participate in a new bailout for Greece until there is an "explicit and concrete agreement" on debt relief from the country's eurozone creditors, an IMF official has confirmed.

Without the IMF's involvement, Greece's eurozone partners will have to find more funds to meet Athens' short-term financing needs, raising questions about whether the outline a86bn (60bn) bailout thrashed out earlier this month will prove workable.

Related: IMF negotiator prepares to join Greek talks as deadline looms