Paris - Fitch ratings agency on Wednesday put the European Union's €500bn bailout fund on review for a possible downgrade, triggered by concerns over France's battle to tame a ballooning budget deficit.
The agency said in a statement that it had placed a "rating watch negative" on the "AAA" score of the European Stability Mechanism - a $650bn fund set up during the eurozone crisis to bail out troubled countries and their banks.
The move comes a day after Fitch placed a rating watch negative on France's "AA+" score.
A downgrade of France, the eurozone's second-largest economy and a key contributor to the ESM, would call into question the creditworthiness of the bailout fund, Fitch said.
France is battling through a deep economic crisis, with zero growth in the previous two quarters and sky-high unemployment.
Paris announced last month that next year's budget deficit - the shortfall between revenue and spending - will hit 4.3% of annual economic output, well above the 3.0% ceiling set by the EU for member states.
Fitch also placed the European Financial Stability Facility (EFSF) on rating watch negative. The EFSF, rated "AA+", was created as a temporary mechanism and no longer gives out fresh loans.
"Fitch anticipates any downgrade of France would be limited to one notch; hence, the impact on ESM... and EFSF's debt issues would be of the same magnitude," it said.