Preuß told the Tischtennis Bundesliga that talks on new contracts are due in November and that he wants to speak to Fan Zhendong, but does not expect quick decisions. He said the open squad planning gave him "a bit of a headache".
Fan, the Olympic champion, joined Düsseldorf from their rivals 1. FC Saarbrücken in the summer. The record German champions have won all six of their league matches and lead the TTBL with a perfect 12-0 points record.
Preuß said Fan's arrival had changed everything from ticketing and merchandise to social media. The club have added two international sponsors, and their matches are shown live in more than 300 cinemas in China.
Düsseldorf have several home matches in November and December, and the city stages a WTT Feeder event at the end of November.
