WOLFSBURG, Germany (Reuters) - Volkswagen's chief negotiator Arne Meiswinkel said on Monday that unions and management needed to find alternative pathways to a solution for its German plants after the company rejected a proposal put forward by unions as unsustainable.

"We continue to need to reduce costs, reduce overcapacity," Meiswinkel said, speaking ahead of the fourth round of negotiations between the company and labour representatives.

(Reporting by Victoria Waldersee, editing by Thomas Seythal)