Euro zone finance ministers meeting in Brussels on Saturday have serious doubts about Greece's request for a bailout and a deal to start negotiating on the basis of Athens' proposals is far from certain, sources close to the talks said. Overnight, the European Commission, European Central Bank and International Monetary Fund gave a positive assessment of the cash-for-reforms plan put forward on Thursday by Greek Prime Minister Alexis Tsipras, according to EU officials. France, Greece's most powerful ally in the Eurogroup of finance minister, also welcomed the proposals on Friday, raising expectations that ministers would agree to open negotiations over the weekend.