Nissan Motor Co. has rejected partner Renault SA's request to send a successor with equal authority to replace ousted Chairman Carlos Ghosn, according to sources close to the matter, in a heightening leadership tussle at one of the world's biggest automaker groups.

Renault, which has retained Ghosn as CEO and chairman following his arrest last month for alleged financial misconduct, made the request during the Japanese automaker's emergency board meeting on Nov. 22, according to the sources.

The proposal was made to protect its business interests and maintain its influence within Nissan following Ghosn's dismissal, the sources said on Tuesday. The French automaker is Nissan's top shareholder.