The 35-year-old's current deal expires this summer, but the German has insisted that he can still perform at the highest level.
"Will I extend in June? I hope so. My wish is to finish my career at the club," he told L'Equipe.
"Every day I am fighting against 20 or 25-year-old guys and I have to be playing at their level."
Van Buyten has also played for Manchester City and Marseille.