Demonstrators sporting the masks depicting German Finance Minister Wolfgang Schaeuble and former Greek Finance Minister Yanis Varoufakis (R) take part in a protest outside the European Central Bank headquarters in Frankfurt, Germany, July 16, 2015. The European Central Bank could be forced by time constraints to delay a funding boost for Greek lenders, a key step towards their reopening, as it waits for Europe to agree a financial backstop that ensures Athens can repay its debts. The text reads 'Debt haircut now! REUTERS/Kai Pfaffenbach