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

The 18-year-old Greek midfielder twisted his ankle coming on as a substitute against Union Berlin; Dortmund awaiting test results to assess severity.

Konstantinos Karetsas sustained an ankle injury in the second half of Dortmund's goalless draw at Union Berlin on Matchday 6. Managing director Lars Ricken confirmed the twist occurred within minutes of the teenager coming on as a substitute. Sporting director Ole Book expressed concern about the injury, saying "I don't feel good about it," though the club has not yet determined how serious it is pending further testing. Karetsas, a Greece international who joined from Genk in the summer, may miss Dortmund's Champions League fixture against Sabah on Tuesday and their Bundesliga match against Eintracht Frankfurt next Saturday.