Ghosn and Greg Kelly, Ghosn's close aide and a former Nissan representative director, were initially arrested November 19 on suspicion of understating in Nissan's securities reports roughly 5 billion yen of the former chairman's 10 billion yen remuneration during the five years through March 2015.
The extension deals a new blow to Ghosn's hopes of being released from the Tokyo detention center where he has been held since his shock arrest.
Ghosn was stripped of his chairman roles at Nissan and Mitsubishi after the allegations emerged, although he remains chairman and CEO of Renault.More news: Police mourn after doughnut van perishes in blaze
The extension that prosecutors won on Monday allows them to continue investigating a third claim that alleges Ghosn sought to shift a personal investment loss onto Nissan's books. He also said he was innocent and hoped to regain his reputation.
Pedestrians look at a television screen showing a news program featuring former Nissan chief Carlos Ghosn in Tokyo on December 21, 2018.
The arrest of the high-flying executive on November 19 at Tokyo's Haneda airport has rocked the world's biggest auto alliance, raising questions over how the two-decade partnership between Nissan and French partner Renault will change after Ghosn's downfall.
While Kelly was released on bail on Tuesday, Ghosn's detention period has been further extended after he was served another arrest warrant on suspicion of aggravated breach of trust against Nissan on December 21. His arrest came after a months-long investigation by Nissan into his conduct, a probe that was largely kept from its French partner.More news: Fatal train accident closes Denmark's Great Belt Bridge
Nissan has also been charged by prosecutors as a corporation involved in the case, according to Japan broadcaster NHK.
If proven, each of Ghosn's alleged offenses may carry a sentence of as much as 10 years, prosecutors have said. He is also credited with saving Nissan from bankruptcy in the 1990s.
Ghosn was born in Brazil, but also holds Lebanese citizenship. I believe my innocence will be revealed in the trial, ' he said.More news: Bernardo Silva accepts pressure is on Manchester City for Liverpool clash