"It would not be appropriate to comment on a case that has been and that is currently before the French judiciary," International Monetary Fund spokesman Gerry Rice told reporters in a briefing.
However, he added, "the executive board has been briefed on this matter, including recently, and continues to express its confidence in the managing director's ability to effectively carry out her duties."
On March 20, French police raided Lagarde's Paris home in connection with the investigation into her decision in 2007, when she was minister in charge of the economy, to ask an arbitration panel to rule on a dispute between disgraced tycoon Bernard Tapie and the collapsed bank Credit Lyonnais.
The arbitration resulted in Tapie being awarded around 400 million euros ($510 million).
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That outcome triggered outrage among critics who insisted the state should never have taken the risk of being forced to pay money to Tapie, a convicted criminal.