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The Dortmund defender is suffering from a minor knee problem and may miss Germany's date in the showpiece final at the Maracana on Sunday.

Germany defender Mats Hummels faces a race against time to be fit for the World Cup final clash with Argentina after suffering a knee injury.

The center back only played 45 minutes on Tuesday as Germany booked its place in the final with a stunning 7-1 victory over hosts Brazil, with the Dortmund man confirming after the match that the problem had been bothering him for a few days.

Coach Joachim Low opted to withdraw him at the break with Germany 5-0 ahead and cruising into Sunday's final, however, team manager Oliver Bierhoff still expects the defender to be involved and insisted Low had only substituted the 25-year-old as a precaution.

"Everyone's okay except for Mats Hummels and he's getting further treatment," Bierhoff told German TV station ARD. "It's a precautionary measure. We assume he'll be able to play in the final."

Hummels revealed he had been nursing the problem prior to the semifinal.

"I've had problems with it for a few days," he said. "But for the first time it didn't go away after warm-ups. In the match it got worse and worse.

"I made the decision that it's perhaps better to take myself out so that I wouldn't break anything.

"We'll have to see exactly what it is. It's not something tiny but fortunately I don't think it's anything that would endanger Sunday."