BERLIN (Reuters) - France and Germany on Thursday called on the management of General Motors (>> General Motors Company) and PSA Group (>> Peugeot) to give a "long-term perspective" for all production sites in the proposed acquisition of Opel from the U.S. carmaker.

They also said that both Opel and Peugeot should keep their own brand names and separate management entities.

"The merged company needs a sustainable strategy for the future with a long-term perspective for all production sites, development centres and staff," French Economy Minister Michel Sapin and his German counterpart Brigitte Zypries said in joint statement published after talks in Paris.

"Workers from both companies need clarity quickly and have to be involved in further talks," the ministers said.

Paris-based PSA and GM confirmed last week that they were in negotiations on a deal to create Europe's second-largest carmaker by sales behind Volkswagen (>> Volkswagen AG), sparking criticism in Germany and Britain amid fears of possible job losses.

(Reporting by Michael Nienaber; Editing by Madeline Chambers)

Stocks treated in this article : Peugeot, Volkswagen AG, General Motors Company