Carlos Ghosn said Nissan Motor Co. and Renault SA are unlikely to stick with one chief executive officer after him, complicating the future of the carmakers' alliance structure.

Ghosn, 61, will continue running Renault and Nissan as long as he has the trust of shareholders, he told reporters in Yokohama on Tuesday.

The 16-year alliance is being tested as the French government is set to double its voting power at Renault and has said it opposes a full merger between the two companies.