Carlos Ghosn, head of Nissan and Renault, is expected to hold talks with General Motors chairman and chief executive officer Richard Wagoner later this week in Paris, according to Japanese press reports citing Nissan spokeswoman Mihoko Takeda.
The talks will assess the mooted three-way tie-up between the firms.
The Kyodo news agency said the meeting may take place before the opening of the Paris Motor Show, which starts Thursday.
The three motor giants announced in July they were undertaking a 90-day consultation on the alliance.
Manufacturers are expected to make a decision by October 15th on whether to go ahead with the partnership.
Mr Ghosn told Automotive News last week that the "ambience" and "spirit" of the work was fairly good, but he admitted he faces an uphill task to convince managers at GM who feel their interests are under threat.
"This is going to have to be friendly, associative, cooperative and performance-driven. That's all. If they don't want it, we'll stop," he said.
GM, currently undertaking a huge restructuring programme, sees the tie up as a way to keep costs under control through synergies of scale.