Van der Vaart spent three years with the Bundesliga outfit before an unsuccessful spell with Real Madrid led to his move to north London.
And, though Arnesen has revealed that the German side would be open to the 29-year-old returning, he insists that the player must show he would want to leave Tottenham.
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"I don't want to talk about it too much because Van der Vaart has a contract at Tottenham Hotspur until 2015. If I get a signal from his end that there might be something, things will be different.
"At the moment it is not practical. He is on holiday after the European Championship. In the next few weeks we will see what happens."