Greece will not be able to make a payment to the International Monetary Fund that falls due on June 5 without a deal with its international lenders, the government's parliamentary speaker said today. 

Athens faces several payments totalling about €1.5 billion to the IMF next month.

It is in talks with the European Union and the International Monetary Fund to clinch a cash-for-reforms deal before it runs out of money. 

"Now is the moment that negotiations are coming to a head. Now is the moment of truth, on June 5," parliamentary speaker Nikos Filis, from the ruling Syriza party, told Greek television. 

"If there is no deal by then that will address the current funding problem, they won't get any money," he said. 

Without access to debt markets or aid, the government has found itself locked in tough negotiations as coffers run dry. 

A payment of about €750m to the IMF last week was only made after emptying a holding account at the Fund. 

Talks with the European Union and International Monetary Fund lenders have dragged on for the past four months. 

A successful conclusion would release around €7.2 billion in aid, but talks have stumbled over pension and labour reform proposed by the creditors and resisted by Athens. 

Filis said said the Greek government would make sure that it has money to pay pensions and wages before servicing debt repayments to the IMF. 

Greece's European lenders yesterday played down Greece's hopes of a swift end to negotiations on an aid agreement and said talks needed to speed up before the country runs out of cash. 

Filis said the government is seeking a deal that will not include further pension cuts, aiming for lower primary budget surpluses and a debt restructuring.