By ESPNSTAR.com staff
Van der Vaart joined Hamburg from Tottenham over the summer but has had a quiet first half of the season with only a goal and five assists to his name as Hamburg lie in 10th place of the Bundesliga.
"I can improve my finishing. Normally I have to score 10 times per season. So far, I only scored one," the 29-year-old told Kicker.
"Of course, if this doesn't work out I have to try to help [the team] in other areas. Even though I succeeded with that, I still expect more of myself. I really felt that I could help the team to win again. But I think I can even help more."
He then took the time to reflect on Hamburg's season so far and stressed that success needs to be built over time and will not come instantly.
He added: "Yes, we do have potential and played some good matches during the first half of the season, but bad ones as well.
"We cannot forget where we're coming from. When I arrived at Hamburg, everybody was saying: 'next year, the big HSV will play in the second league'.
"Now, all of the sudden, everyone expects us to qualify for the Europa League again. This is too fast for me."