The 29-year-old former Spurs midfielder believes that there should not be so much expectancy on his shoulders, before hinting that his current club could be his last in football
The Netherlands international returned to the club after two seasons in London with Tottenham, in a €13 million (£10.5m) deal earlier this summer.
After spending three years with Rothosen between 2005-2008, some supporters have labelled the 29-year-old as the returning "prodigal son", a tag he is keen to shake off.
"I am not a saviour! I know that people expect many miracles from me, but I cannot make water run!" Van der Vaart jokingly enthused to Bild am Sonntag.
"[I have come] to play good football and to improve the quality of the team. Dortmund has led the way. They were away from the top four years [ago], and now? [They are] twice champions.
"It is very possible that Hamburg will be my last stop [before retirement]. Unless someone at the club tells me: "I'm sorry, Rafa. That's enough for you!"
Hamburg currently sit in 16th place in the Bundesliga, having lost both of their opening two games.