Bad loans from Spanish banks, a major source of concern to financial markets, rose in July to the highest level in 16 years at nearly seven per cent, the Bank of Spain said on Monday. Bank loans whose recovery is in doubt amounted to 124.7 billion euros ($A166.5 billion), or 6.94 per cent of total assets, in July, the central bank said in a report - the highest ratio since February 1995. That compares to a revised bad loan ratio in June of 6.69 per cent. The central bank had previously said the bad loan ratio was 6.42 per cent that month. Advertisement: Story continues below Bad loans at Spanish lenders, especially its regional savings banks which account for half of all lending, have risen steadily since the collapse of the property sector at the end of 2008. The bad loan ratio at Spanish banks stood at 3.37 per cent at the end of 2008. Earlier this month Spain's struggling Caja Mediterraneo, under state control since July, reported a bad loan ratio of 19 per cent, fuelling concerns about the state of balance sheets across the banking sector. The financial health of Spanish banks is at the heart of market fears that Spain could follow the example of Ireland, Greece and Portugal in seeking a bailout from the European Union and the International Monetary Fund. The government and Bank of Spain have forced a wave of consolidation in the sector this year and are requiring banks to quickly increase the proportion of core capital they hold to above international norms. In July, Moody's threatened to lower the ratings of four Spanish banks, including the euro zone's largest, Santander, as well as the country's confederation of savings banks. The three other banks concerned are BBVA, CaixaBank and La Caixa.