Euro zone finance ministers are likely to back a bailout for Portugal on Monday and tell Greece it must deliver on agreed fiscal and privatization targets if it wants new emergency financing next year.
Greece denied reports on Tuesday it was discussing a new 60 billion euro ($84 billion) bailout with international lenders and its borrowing costs rose amid fears it may have to restructure its debt without further EU help.
A euro zone source involved in the preparation of the monthly meeting of ministers from the 17-member single currency area said a discussion of new aid for Greece, on top of the already agreed 110-billion-euro bilateral loans from the euro zone and the IMF was premature.
But the source said the euro zone might consider more aid, once Greece delivered on already-made promises, although this may require additional austerity steps.
"There is no question about a new bailout package for Greece -- it is about implementing what has been decided and announced," the euro zone source said.
"They need to show to the EU and the IMF they can deliver on the existing program. To show that, there probably has to be an announcement of additional measures," the source said.
The source stressed Athens had to improve the credibility of its privatization program, which envisages revenues to state coffers of up to 50 billion euros