Dortmund's Karetsas Hospitalized After Champions League Health Scare

What happened

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Borussia Dortmund teenager Konstantinos Karetsas was taken to hospital for further tests after suffering circulatory problems during Tuesday's 3-2 Champions League victory over Villarreal. The 18-year-old went down without contact during the first half at Signal Iduna Park and received treatment on the pitch before being carried off.

Dortmund said Karetsas was doing well under the circumstances. The Bundesliga's official website reported that the Greece international left after 27 minutes and was replaced by Ethan Nwaneri. The club's match report said Karetsas had raised his arm during an attacking move, sat down and was attended by two doctors before leaving on a stretcher.

The available update is limited to the club's description of circulatory problems and its decision to send him for checks. Dortmund has not announced a more specific diagnosis or a timetable for his return, so no broader medical conclusion can be drawn from the incident.

Why it matters

The episode overshadowed an eventful European opener for Dortmund. Karetsas was making his fifth appearance for the club after joining from Genk during the summer, according to the Bundesliga. His early departure forced coach Niko Kovac to change the attacking shape long before halftime and added another personnel concern to a squad already dealing with several absences.

Dortmund recovered from a scoreless first half to win 3-2. The club's official report recorded a Villarreal lead through an own goal before Serhou Guirassy scored twice, including once from the penalty spot. A late own goal at the other end narrowed the margin, but Dortmund held on to begin its Champions League campaign with three points.

Tournament impact

The result gives Dortmund a winning start in the league phase, but Karetsas's condition is the immediate priority. Any football decision about his availability will depend on the outcome of the hospital assessments and guidance from the club's medical team. Dortmund's next scheduled match is against Paderborn on September 12, the Bundesliga said.

Karetsas had earned an early role after his summer move, and his fifth club appearance came on one of Europe's largest stages. That makes his status relevant not only for the next domestic fixture but also for Kovac's options as Dortmund moves deeper into a congested run of league and Champions League matches.

What to watch

The next meaningful development will be a formal update from Borussia Dortmund following the tests. Until then, the confirmed information remains that Karetsas experienced circulatory problems, was conscious enough for the club to describe him as doing well under the circumstances, and was transferred to hospital for further evaluation. His return should be discussed only after Dortmund provides new medical information.