By Svenja O’Donnell and David Tweed Feb. 9 (Bloomberg) -- Greek Finance Minister George Papaconstantinou said he can’t call for outside aid as his government struggles to cut the European Union’s largest budget deficit. “The worst possible signal which we could send out is one calling for outside help,” he said in an interview with Bloomberg Television in Athens yesterday. “We will tackle the deficit,” he said, adding that tax revenues in January exceeded forecasts “by some percentage points.” Papaconstantinou has so far failed to convince investors that Greece can push the deficit below the EU’s ceiling of 3 percent of gross domestic product. With European leaders meeting on Feb. 11 to discuss the economic outlook, Greek two-year bond yields have surged to the highest in almost a decade and concerns about budget sustainability are spreading to Spain and Portugal. “The current state of the markets suggests Greece may need conditional support from the key European institutions and governments,” said Janet Henry , chief European economist at HSBC Holdings Plc, in an e-mailed note. European finance officials are for now sticking to their line that Greece, which has a deficit of 12.7 percent of GDP, won’t need outside help. European Central Bank President Jean- Claude Trichet said Feb. 4 he’s “confident” measures announced by Greece will work and EU Monetary Affairs Commissioner Joaquin Almunia says there’s no “plan B” for Greece. Woes Overshadow Greece’s budget woes threaten to overshadow a summit of European Union leaders that compelled Trichet to shorten his trip to a Reserve Bank of Australia symposium in Sydney by one day. The EU meeting was called to lay the groundwork for a 10- year economic program to strengthen the region’s competitiveness. Nobel Prize-winning economist Joseph E. Stiglitz said in an interview with Sky News yesterday that Greece has been the target of a “speculative attack” and doesn’t need a bailout. Papaconstantinou said yesterday that Greece’s budget plan will get the “green light” from European finance ministers. He may this week unveil an overhaul of Greece’s tax system that imposes the top 40 percent levy on Greeks earning less than the current threshold of 75,000 euros per year. Investors are turning a deaf ear to EU officials as Greece’s fiscal woes focus their attention on gaping budget deficits across the euro region’s southern fringe. Credit- default swaps on Spain and Portugal rose to a record yesterday. Raise Concern “Greece, Portugal and Spain have the most challenging fundamentals but Italy and Belgium could also start to raise some concerns,” said HSBC’s Henry. Italian Finance Ministry Undersecretary Luigi Casero told Sky TG24 yesterday his government must “maintain a policy of fiscal rigor” to avoid “difficulties.” Trichet’s efforts to shore up confidence in the euro region as a whole are also being ignored. While the ECB president said on Feb. 4 the bloc’s combined budget deficit may be lower than those of the U.S. and Japan this year, the euro fell the next day, extending its slide since the start of December to almost 10 percent. To contact the reporters on this story: Svenja O’Donnell in London at sodonnell@bloomberg.net ; David Tweed in Athens on jtweed@bloomberg.net .