Eurozone ministers have cast doubt over a new Greek austerity plan, as they meet in Brussels to decide on a 130bn euro ($170bn; £110bn) bailout fund. German Finance Minister Wolfgang Schaeuble said the Greek plan was "not at a stage where it can be signed off". The Greek government brokered a deal after days of negotiations between the parties in its fragile coalition. Few details of the plan have been released, but unions have already called a 48-hour strike in protest. Luxembourg's Prime Minister Jean-Claude Juncker, head of the so-called eurogroup of finance ministers, said he doubted whether the Greek plan was ready for approval. "I do not have reasons to believe that there will be a definitive deal this evening," he told reporters as he arrived for the Brussels meeting. But he hailed the progress Greece had made and said eurozone countries were likely to thrash out a deal with Athens by next week. Greece is trying to negotiate the bailout from the EU and International Monetary Fund (IMF). It is the second such bailout, and lenders have insisted on more austerity measures in return for the loan. The government needs the backing of the eurozone ministers and the approval of the Greek parliament before the deal can be finalised. The plan includes 15,000 public-sector job cuts, liberalisation of labour laws, lowering the minimum wage by 22% and negotiating a debt write-off with banks. But a key demand of the EU, IMF and European Central Bank was reform of the pension system, an issue that proved to be a stumbling block. Prime Minister Lucas Papademos tried to convince his coalition partners to overhaul pensions and save 300m euros a year. Talks broke up without an agreement, but officials later announced that a compromise had been reached. It was not clear how the 300m euro saving would be made. Greece is already feeling the effects of an earlier round of austerity, put in place as part of a deal to release funds from a previous bailout. Those cuts triggered widespread unrest and violent protests. Greece is deep in recession with unemployment rising above 20%.