An agreement is needed keep the country in the eurozone and avert bankruptcy.
Earlier, Reuters quoted a Greek official as saying an agreement had been reached in talks between Greece and its lenders in Athens.
Greece has agreed the function of a new independent privatisation fund, and how non-performing bank loans will be administered, according to the official.
Both issues had been key sticking points in negotiations.
"Finally, we have white smoke," the official was quoted as saying.
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