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Portugal's banking sector has gone through a transformative intervention, making its risk to Europe's banking system small, Antonio Roldan Mones, Portugal analyst at Eurasia Group.
Alberto Gallo, head of European macro credit research at RBS, says Banco Espirito Santo has capital problems not solvency issues.
Paulo Soares de Pinho, associate professor at Nova School of Business and Economics, says the issues at Banco Espirito Santo won't spread across Portugal.
Pedro Santana Lopes, former Portuguese Prime Minister, says Banco Espirito Santo has a "good solvency situation" but the family behind the lender has questions to answer.
Pedro Santana Lopes, former Portuguese Prime Minister, says the government will not pay for Banco Espirito Santo.
Otto Dichtl, managing director at Stifel Nicolaus, says there are "question marks" around the amount of capital Banco Espirito Santo has, but the lender is unlikely to default.
Edward Hugh, an independent economist, says the euro zone debt crisis has not returned but the issues in Portugal are a "warning shot" that it might be back soon.
Giovanni Sabatini, managing director of the Italian Banks Association, says Italian Banks are in "good shape" and have worked hard to prepare for the asset quality review.
Khoon Goh, Senior FX Strategist at ANZ, expects the Japanese yen to weaken against the U.S. dollar soon if the problems in Portugal's banking sector don't escalate.
Mikio Kumada, Executive Director & Global Strategist at LGT Capital Partners, discusses the concerns surrounding the euro zone's periphery markets.
James Lowell, CIO of Adviser Investments, expects markets to recoup losses once investors realize that fears over Portugal's banking sector are "individual and isolated."
The Fed issued a cease-and-desist order and a $975,000 fine to Banco Espirito Santo for a violation in 2012.
Banco Espirito Santo was fined $975,000 by the Federal Reserve in 2012. CNBC's Michelle Caruso-Cabrera provides insight to the fine.
Shares in one of Portugal's main banks, Banco Espirito Santo, were suspended from trading after dropping another 17 percent, Dow Jones reported.
Portugal suspends the trading in Banco Espirito Santo shares, reports CNBC's Michelle Caruso-Cabrera.
Art Cashin, UBS director of floor operations, discusses how problems in Portugal have spilled over to spook the U.S. stock market.
CNBC's Karen Tso reports there's a selloff in global markets triggered by disappointing economic data and concerns around troubled Portuguese banks.
Jim Iuorio, TJM Institutional Services shares his thoughts on what's prompting the selloff in European markets.
CNBC's Karen Tso reports European shares fell sharply on weak economic data and fears about Portugal's banks.
Antonio Barroso, senior vice president at Teneo Intelligence, says the Portuguese government will not backtrack on its tough austerity reforms, but will need to offer voters incentives ahead of the election.