Vitesse Arnhem insist they won't pull out of talks with Southampton over Alexander Buttner's sale.

Vitesse say the ball is in Buttner's court after an extra demand came from his representatives - which the Dutch club refuse to meet.

"We have an agreement with Southampton and had thought that he had an agreement. Apparently that is not so. We have given him everything to finish it," said Vitesse technical director Ted van Leeuwen.