Renault SA is considering reducing its 43.4 percent stake in Nissan Motor Co. in a bid to gain support from its Japanese partner for the revival of its merger plan with Fiat Chrysler Automobiles N.V., according to sources close to the matter.

The merger proposal was dropped in June after two members sent from Nissan deferred making a decision on the plan at a Renault board meeting.

The French-Japanese group has started discussions on changes in the alliance's capital structure and may reach an agreement in September at the earliest, the sources said Monday.