Banks are hoarding the European Central Bank's record 489 billion-euro ($625 billion) injection into the banking system, thwarting attempts by policy makers to avert a credit crunch in the region.

Almost all of the money loaned to 523 euro-area lenders last month wound up back on deposit at the Frankfurt-based central bank instead of pouring into the financial system, according to estimates by Barclays Capital based on ECB data. Banks will use most of the money from the three-year loans to meet their refinancing needs for this year and next, analysts at Morgan Stanley and Royal Bank of Scotland Group Plc estimate.

"It's illusory to think that the measure will translate into credit generation," Philippe Waechter, chief economist at Natixis Asset Management in Paris, said in an interview. "It will assuage some of the anxiety banks have regarding their liquidity needs. But they've engaged into a massive overhaul of their strategy and shrinkage of their balance sheets, which is, coupled with the deteriorating economy, not compatible with increasing credit."