By Inti Landauro

PARIS--French Finance Minister Michel Sapin Friday said he wants the country's market regulator to open an investigation into a newspaper report that said Moody's Investors Service Inc. had told the French government about an imminent change in France's credit rating.

French newspaper L'Opinion Thursday reported that Moody's had given the French government notice about a possible downgrade of its credit rating to AA2 from AA1.

"That affirmation had an impact on the markets," Mr. Sapin said Friday.

Luc de Barochez, L'Opinion's web chief editor, declined to comment. A spokesman for Moody's did not have an immediate comment.

In January, Moody's placed France's rating on negative outlook due to falling competitiveness as well as the risk of further deterioration in the financial strength of the government.

Noemie Bisserbe in Paris contributed to this article

Write to Inti Landauro at inti.landauro@wsj.com

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