By Renee Maltezou BRUSSELS (Reuters) - Greek Finance Minister Yanis Varoufakis called on European ministers on Saturday to extend his country's bailout by a few more weeks to take account of a referendum on austerity demands by creditors, urging them to show flexibility. "We are going to suggest to them that under these circumstances we should have an extension for a few weeks to ensure that the people are heard," Varoufakis told Reuters, on his way to a Eurogroup meeting of finance ministers. How far it will get remains in doubt given comments from several European ministers that the decision to call a referendum on July 5, after the debt deadline, effectively closed the door on further negotiations.