An advisory committee established by Japanese car giant Nissan to improve governance after the stunning arrest of former boss Carlos Ghosn on corruption allegations has unveiled recommendations to prevent further scandals.

The seven-person body suggested abolishing the position of chairman vacated by Ghosn, with an external administrator running meetings of the board, where independent members would hold the majority. 

"I think it's a bold proposal to remove the chairman's position" which exists in many Japanese companies, Sadayuki Sakakibara, co-chairman of the advisory committee, said. 

The other co-chairman, Seiichiro Nishioka, said the main cause of the misconduct was "the concentration of authority in Ghosn".

"He created a situation in which it would be difficult to detect his pursuit of personal gain," Nishioka added. 

Nissan was rocked when Japanese prosecutors said Ghosn had deferred his salary by nine billion yen ($81m) over a period of eight years. 

They also charged him with attempting to shift personal losses onto the company books. 

In an emotional news conference on the night of Ghosn's arrest on November 19, chief executive Hiroto Saikawa said his former mentor had held too much power alone. 

Ghosn was swiftly removed as chairman and the advisory body set up to improve Nissan governance amid questions over how this could have happened at such a major company. 

Carlos Ghosn

A spokesman for Ghosn said the allegations in the report "will be revealed for what they are: part of an unsubstantiated smear campaign against Carlos Ghosn to prevent the integration of the Alliance and conceal Nissan's deteriorating performance."

"Mr Ghosn acted at all times with the full authority of the board and its shareholders and his paramount goal was achieving value for Nissan's shareholders," added the spokesman in an emailed statement.

The report stopped short of proposing the removal of Saikawa, even though questions continue to be raised about his role in the scandal. 

Saikawa has said he only became aware of Ghosn's alleged misconduct in late 2018 but sources close to the case say he knew long before that. 

He is thought to have signed an agreement in 2012 mentioning a transfer of $40m to Ghosn after his retirement. 

The same document also put lodgings in Beirut, Rio de Janeiro and Paris at Ghosn's disposal. 

Nissan did not comment on this alleged document. 

The future of the three-way alliance between Nissan, fellow Japanese carmaker Mitsubishi Motors and French manufacturer Renault was the subject of further media speculation this week. 

The Financial Times reported that Renault wanted to restart merger talks with Nissan "within 12 months" and then forge a tie-up with another group, possibly Fiat Chrysler. 

The three-way tie-up, forged by Ghosn to save Nissan from the brink of bankruptcy, celebrated the 20th anniversary of its creation yesterday. 

Ghosn himself was surprisingly released on bail on March 7 and has since taken up residence in Tokyo as he awaits his trial, expected after the summer. 

His lawyer has said his client plans to hold a press conference towards the end of next month and continues to plead his innocence.