Crédit Agricole, BNP Paribas and Société Générale all face a possible downgrade because they could face losses on a Greek default.

Credit ratings are a measure of how likely a company or country is to repay its debts. Moody's has already downgraded the credit ratings of eight Greek banks. European leaders have yet to agree on the terms of a second bail-out for Greece.

On Wednesday, the country is expected to see another wave of general strikes against austerity measures. In a statement, Moody's said: "Today's actions reflect Moody's concerns about these banks' exposures to the Greek economy."

Société Générale and Crédit Agricole both hold majority stakes in Greek banks. BNP Paribas does not have a stake in a Greek bank, but Moody's estimates that it held about €5bn (£4.4bn, $7.2bn) of Greek government debt as of December 2010.


Press release