The case has been a cloud over Lagarde's career and private life, however. In 2013, Lagarde's home was raided by anti-corruption police investigating the case. She was charged with "negligence" last August but said she had no intention of resigning from the IMF. Her current term of office ends next July and, so far, Lagarde has given no indication either way on whether she would seek re-selection.
On Thursday, the IMF reaffirmed its confidence in her leadership. "As we have said before, it would not be appropriate to comment on a case that has been and is currently before the French judiciary. However, the Executive Board continues to express its confidence in the Managing Director's ability to effectively carry out her duties. The Board will continue to be briefed on this matter," the IMF's communications director Gerry Rice said in a statement received by CNBC.
Tapie has not escaped from the re-opening of the case unscathed either. Earlier this month, the tycoon was ordered to pay back the 404 million euros awarded to him (as well as interest on the debt and legal costs) and told Le Monde newspaper that he was "totally ruined" by the court's decision. He is also expected to make an appeal against the repayment.
-By CNBC's Holly Ellyatt, follow her on Twitter @HollyEllyatt. Follow CNBC International on Twitter and Facebook.