The Alco survey for news website Newsit found 74 per cent backed the euro, while 18 per cent prefer a return to a national currency. It found 50 per cent supporting major concessions, with 41 per cent opposed.
The poll comes a day after Greece opted to bundle four payments due this month to the International Monetary Fund totalling 1.6 billion euros ($1.8 billion) into a single repayment on June 30. The move prompted widespread losses across European stock markets Friday.
Prime Minister Alexis Tsipras is set to address an emergency session of parliament later amid growing discontent within his left-wing Syriza party.