PARIS, May 20 (Reuters) - Stellantis' site in Rennes will produce a new car made by Dongfeng and Stellantis will pilot this joint venture, said the CFDT trade union.

Stellantis is set to formally announce this joint venture with Dongfeng and a deal to build at least one fully electric Voyah brand vehicle for the state-owned Chinese carmaker at the Franco-Italian company's factory in Rennes, France.

(Reporting by Gilles Guillaume;Editing by Sudip Kar-Gupta)