PARIS — The woes keep mounting for Carlos Ghosn.

Renault’s board voted unanimously on Wednesday to cancel tens of millions of euros in compensation that he was set to receive as its chairman and chief executive, days after the French carmaker notified the judicial authorities that he may have misused company money.

Also on Wednesday, the embattled executive hired a star Japanese lawyer known as “the Razor” to prepare for his trial in Tokyo. Mr. Ghosn has been detained since November, facing charges of financial wrongdoing as the head of Nissan, the Japanese carmaker that he also ran as part of a global auto alliance with Renault and Mitsubishi.

Renault, in a statement, said its board would waive a clause in Mr. Ghosn’s contract that would have granted him the equivalent of two years’ salary for not going to work for a competitor.

Mr. Ghosn resigned from Renault last month. The windfall would have been worth about 5 million euros, according to a person with knowledge of the matter, who was not authorized to speak publicly.