Hadi Zablit, 49, will oversee industrial cooperation projects to improve the efficiency and financial performance of the partnership, a source close to the matter told AFP on Friday, confirming a report in French newspaper Le Figaro.
The operational revamp aims to mark a new start for the trio as they battle to emerge from the shadow cast by the legal woes of Ghosn, detained last November over allegations of financial impropriety.
Zablit is currently business development chief for the French-Japanese auto alliance, which sold 10.6 million vehicles worldwide in 2017.
The dual citizen, born in Lebanon, first joined Renault as an engineer and product manager in 1994. He left to work for the Boston Consulting Group in 2000 and returned to the French car giant nearly three years ago.
Ghosn's sudden arrest last year at a Tokyo airport sent shockwaves through the business world.
The 65-year-old Brazil-born executive - one of the world's best-known and respected tycoons - is now out on bail after 130 days in a Japanese detention centre.
He faces charges of deferring part of his salary until after his retirement and concealing this from shareholders, as well as syphoning off millions in Nissan cash for his own purposes.
Ghosn says he is innocent and is seeking to have his case declared null and void -- even if legal experts and his own defence deem his chances unlikely.