European Commission chief has criticized the Greek government, arguing that he feels "betrayed" by "egotism" shown by the Greek officials during talks between Athens and its international creditors.

"After all the efforts I deployed from the commission, I feel betrayed because these efforts were insufficiently taken into account," Jean-Claude Juncker said during a press conference on Monday. 

Speaking at a press conference in Brussels, Juncker defended the creditors' bailout proposals and said they were "fair." 

He also lashed out at the Greek government for what he called making “delayed” or “deliberately altered” proposals during talks over Athens debt crisis.

Meanwhile, the European Commission president accused Greece of breaking the negotiations by "unilaterally" announcing a referendum on the country's bailout and the reforms demanded by its lenders on July 5.   

Greeks will go to the polls to decide on whether to accept the bailout measures offered by international creditors including tough austerity measures or to reject the bailout terms and exit from the eurozone.

Talks between Greece and its international creditors fell apart on Friday after two sides failed to find a way to avert a looming cash crunch in the embattled eurozone country. 

The Greek government has already blamed the creditors’ terms for the failure of the bailout talks.

“[Rejection] of the Greek government’s request for a short extension of the program was an unprecedented act by European standards, questioning the right of a sovereign people to decide,” Greek Prime Minister Alexis Tsipras said on Sunday.

Greece and its international lenders, including the European Central Bank, the International Monetary Fund (IMF) and the European Commission, have been embroiled in months of marathon talks over terms of a new bailout plan.

Greece should make a €1.6 billion payment to the IMF on Tuesday, after its creditors refused to extend emergency funding to Athens.

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