If Greece were to accept the plan, lenders would aim to unlock 10.9 billion euros in unused bank bailout funds that were returned to the European Financial Stability Fund. This would enable Greece to cover its financial needs through July and August, the sources said.

In a five-page proposal presented to Greek Prime Alexis Tsipras in Brussels on Wednesday, EU/IMF lenders asked Athens to reduce spending on pensions by 1 percent of gross domestic product and promise not to reverse any legislated reforms, the sources said.

They also demanded Athens raise 1.8 billion euros - or 1 percent of GDP - by increasing value-added tax to 11 percent for items including drugs and 23 percent for items including electricity, the sources told Reuters.

They want Greece to scrap a benefit for low income pensioners, called EKAS, to save 800 million euros by 2016 - a move that if accepted, would force Tsipras to violate his pledge to avoid any new pension cuts.

The proposal also calls for a hike in healthcare contributions by Greeks and a cut in the fuel subsidy.

The lenders have also demanded Tsipras not make any unilateral move to restore collective bargaining rights and raise minimum wage level to pre-crisis levels - pledges he made before coming to power in January.

The proposal also asks Athens to commit to privatising Grid operator ADMIE, Greece's major ports in Piraeus (>> Piraeus Port Authority S.A.) and Thessaloniki (>> Thessaloniki Port Authority S.A.), the former airport complex of Hellenikon, Greece's biggest oil refinery Hellenic Petroleum (>> Hellenic Petroleum S.A.) and Greek telecoms operator OTE (>> HELLENIC TELECOM. ORGANIZATION S.A.).

Some of the asset sales mentioned - like ADMIE and Hellenikon - have been staunchly opposed by Tsipras's Syriza party.

The proposal does not make any mention of offering debt relief to Athens, the sources said, which was one of the government's major demands though the two sides have suggested it could be dealt with at a later stage.

(Editing by Deepa Babington and Janet McBride)

By Renee Maltezou