Germany midfielder Sami Khedira believes there is room for improvement ahead of their clash with Serbia.
The Germans have arguably put in the most impressive performance at the World Cup with their 4-0 demolition of 10-man Australia.
Stuttgart ace Khedira is calling for a repeat of that display against Serbia as Germany look to take a major step towards the second round
"We have to be highly concentrated going into the game," Khedira told the German Football Association's official website.
"We need to take the momentum from the game against Australia into this match.
"But it will not be easy because the Serbs have to win - for them, it is already a final, and they have a lot of good individual players.
"We are focused on the tournament. We had a good start and we also know that we must continue working hard.
"We want the second victory and to continue to play winning football. We can always improve things."