Nissan chief executive Hirota Saikawa said on Monday that he had not heard directly about a reported French proposal to integrate the Japanese car maker's management with Renault, adding that it was not the time to discuss revising the partners' capital ties.
The Nikkei newspaper reported on Sunday that a French government delegation had informed Tokyo that it would seek an integration of Renault and Nissan, most likely under the umbrella of a single holding company.
"Since I have not heard this directly, I cannot comment," Mr Saikawa told reporters.
Asked about future capital ties, he said: "We are not at the stage for such discussions."
Japanese public broadcaster NHK quoted French Economy Minister Bruno Le Maire saying that an integration proposal was "not on the table now".
The fresh reports of closer integration come as ousted Nissan chairman Carlos Ghosn remains in detention following his November 19 arrest and subsequent charges of financial misconduct, which he has denied.
Mr Ghosn, under pressure from the French government, had pushed for a deeper tie-up between the two car makers, including possibly a full merger, despite strong reservations at Nissan.
A source familiar with Nissan's thinking said the reported French proposal did not "make sense" given the two companies' different cultures, Renault's lower productivity and Nissan's bigger contribution of key technology.
"It's a virtual merger, I don't think it makes sense," the source said, adding he had not heard directly of such a French proposal.
Mr Ghosn has asked a Tokyo District Court again to grant him bail after a request last week was denied, citing flight risk and concerns about evidence tampering.
A decision is expected on Monday.
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Mr Ghosn has offered to post stock he owns in the car manufacturer as collateral, surrender his passports and submit to electronic tracking as part of a renewed effort to persuade a Tokyo court to grant him bail while he awaits trial on charges of financial misconduct, a spokeswoman for the executive said. Any bail must be paid in cash.
Mr Ghosn spearheaded Nissan's turnaround two decades ago, and his arrest has jolted the industry, while muddying the outlook for Nissan's three-way alliance with Renault and Mitsubishi Motors.
Renault, which dominates the partnership through its 43.4 per cent stake in Nissan, is expected to meet within days to consider potential candidates to replace Mr Ghosn as chief executive and chairman.
The co-chair of a committee set up by Nissan to examine the root cause of Mr Ghosn's alleged financial misconduct and propose corporate governance reforms said on Sunday he believed Mr Ghosn may have had questionable ethical standards.
"Having read the report on the internal investigation, my initial impression was that the head of the company may have had questionable ethical standards," committee co-chair Seiichiro Nishioka said on Sunday, after the panel held its first meeting.