The Greek government indicated in a call on Tuesday with euro zone finance ministers that it could change its stance on the referendum it has called for Sunday if a request for a new loan could be agreed, euro zone sources said. The Eurogroup will reconvene by telephone on Wednesday at 0930 GMT to discuss a new proposal from Prime Minister Alexis Tsipras that modifies an offer made last week by creditors, some sources said. Several sources familiar with the talks said Greek Finance Minister Yanis Varoufakis told the Eurogroup in a teleconference which was at times difficult for ministers to follow that his government would either call off the vote or recommend electors vote 'Yes' to a deal with creditors if an agreement were reached.