Konstantinos Karetsas injury leaves Borussia Dortmund waiting on tests

"Something's not quite right with it," Lars Ricken said after Borussia Dortmund's goalless draw with Union Berlin. Minutes after coming on at Union Berlin vs Borussia Dortmund, Konstantinos Karetsas twisted an ankle and Dortmund were left waiting for further testing.

Dortmund's concern after the draw

Ricken's line was followed by more unease from Ole Book, who said: "Let's hope it's not too serious. At the moment, I don't feel good about it." The club's tone matters here because this was not a long, slow injury problem. Karetsas was on the pitch for only 8 minutes before the ankle issue surfaced.

Dortmund may have to travel to Sabah FA for their UEFA Champions League clash on Tuesday without him. That is the immediate problem for a team that came away from Matchday 6 with only a draw and still has little clarity on how serious the setback is.

Karetsas' recent run

The injury also interrupts a small but noticeable run for the summer signing from Genk. Karetsas was making his fifth Bundesliga appearance this season, had 1 assist in the league, and had already logged 190 Bundesliga minutes before this setback.

That is not a huge body of work, but it does show Dortmund had been easing him in rather than throwing him straight into heavy minutes. The ankle problem arrived just as he was starting to build rhythm, and the club now have to wait on the scans before they can say anything firmer.

Dortmund's next Bundesliga match is at home to Eintracht Frankfurt on Matchday 7 next Saturday.