Borussia Dortmund 'not feeling good' about Konstantinos Karetsas ankle injury

· Bundesliga-Official

Borussia Dortmund are awaiting tests on an ankle injury sustained by 18-year-old attacking midfielder Konstantinos Karetsas in the goalless draw at Union Berlin on Matchday 6.

Dortmund managing director for sport Lars Ricken said Karetsas twisted an ankle within minutes of coming on as a second-half substitute in the goalless draw at Union .

Ricken said: "Something's not quite right with it. We'll have to do further testing to determine how serious the injury is."

The club's sporting director Ole Book added: "Let's hope it's not too serious. At the moment, I don't feel good about it."

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