Karetsas' Health Scare Overshadows Dortmund's Win in Spain

For a few long seconds in Villarreal, football stopped feeling like football.

Eighteen-year-old Konstantinos Karetsas had just rolled a simple pass into midfield when something was clearly wrong. He slowed, raised an arm towards the referee, then sank to the turf, sitting down as teammates and opponents rushed towards him and the stadium fell into a stunned hush.

Medical staff sprinted on. Players turned away, some with hands on their heads. It was the teenager’s Champions League debut for Borussia Dortmund. It instantly became a night about something far more important.

Dortmund confirm circulatory problems

Dortmund moved quickly to address the growing anxiety. In a statement released shortly after the incident, the club confirmed the issue was related to Karetsas’ circulatory system.

“Konstantinos Karetsas had to leave the field due to circulatory problems,” the Bundesliga side announced. “Kosta is doing well under the circumstances and is on his way to the hospital for further tests.”

Inside the dressing room, the concern was just as raw. Speaking after the final whistle, goalkeeper Gregor Kobel gave voice to the mood within the squad.

“I hope and I think that everything is OK and I hope that he's back and fit with us soon,” he told broadcaster Amazon Prime, his words underlining both the worry and the determination to stay positive.

At the time of Karetsas’ withdrawal, the game was still goalless. The football, for a while, felt secondary.

A brutal twist to Dortmund’s transfer gamble

Karetsas arrived at Signal Iduna Park in the summer as one of the centrepieces of Dortmund’s aggressive recruitment drive for elite young talent. Signed from Genk for around €30 million (£25.7m/$34.9m), the former Belgium youth international was expected to grow into a key figure in the club’s European campaign.

He was not alone. Fellow Greece international Giannis Konstantelias joined in the same window, a €26m (£22.3m/$30.2m) capture from PAOK. The plan was clear: build a new Dortmund core around two of Europe’s brightest prospects.

That plan has been ripped apart in brutal fashion.

Konstantelias’ season was likely ended last month when he suffered a serious ACL injury on his Bundesliga debut. Now Karetsas’ worrying collapse has added another layer of anxiety to an already grim run of luck with their marquee signings.

For Niko Kovac, it is more than just bad fortune. It is a tactical and emotional headache as the fixtures pile up at home and in Europe, and the squad is forced to adapt on the fly without two players earmarked as central to this project.

Guirassy delivers on landmark night

Once play resumed in Spain, the match finally snapped back into life. The tension that had gripped the stadium gave way to a chaotic, open contest, and Dortmund eventually found a way to channel their emotion.

The game swung, chances came and went, and then Serhou Guirassy took control.

On his 100th appearance for the club, the forward stepped up when Dortmund needed him most, striking twice late on to seal a 3-2 victory and drag three precious points back to Germany. In doing so, he moved past Robert Lewandowski’s tally for the club, a milestone that would usually dominate the headlines on a night like this.

Instead, his goals felt like an important detail rather than the main story. They kept Dortmund’s Champions League campaign firmly on track, but every question afterwards circled back to the same subject: Karetsas.

Result secondary as Dortmund wait on news

The win in Spain matters. In a tight group, it could prove decisive. It showed resilience, character, and a capacity to respond under pressure.

But the image that will linger is an 18-year-old sitting on the grass, signalling for help on the biggest night of his young career.

Dortmund’s statement offered cautious reassurance. Kobel’s words carried hope. The tests to come will tell the rest of the story. For a club that has invested its future in Karetsas and Konstantelias, and for teammates who watched the drama unfold just metres away, one question now dwarfs all others: how quickly can their young midfielder safely return to the pitch, and what will this mean for the season they thought they were building?