Photo/IllutrationFormer Nissan Motor Co. Chairman Carlos Ghosn speaks at the company's shareholders meeting in Yokohama on June 26. (Asahi Shimbun file photo)

NEW YORK--Former Nissan Motor Co. Chairman Carlos Ghosn has added a heavyweight law firm headquartered here to help defend himself against allegations of under-reporting his income in Nissan's securities reports.

Ghosn has retained the international law firm of Paul, Weiss, Rifkind, Wharton & Garrison LLP, which represents clients in major companies in the United States and leading financial institutions on Wall Street, according to related sources.

The Wall Street Journal reported on Nov. 25 that Brad Karp, chairman of the law firm, and Michael Gertzman, a partner in the firm, will represent Ghosn.

Ghosn has already retained Japanese lawyer Motonari Otsuru, who once led the Tokyo prosecutors department.

It is not yet known how the U.S. lawyers will be involved in defending Ghosn, as lawyers cannot serve as a defense counsel in criminal trials in Japan unless they are licensed to practice law in the country.

Ghosn was arrested on Nov. 19 on suspicion of under-reporting his income by billions of yen. He is currently being held at the Tokyo Detention House.