Borussia Dortmund forward Konstantinos Karetsas leaves the pitch on a stretcher during the first half of their Champions League match against Villarreal and is taken to hospital. Both outlets report that he collapses or is forced to stop playing during the game and is subsequently transported for medical assessment.

Dortmund describes the issue as “circulatory problems,” and Al Jazeera characterizes the incident as a collapse during the match. Yahoo Sports also cites the club’s statement that Karetsas has to leave the field due to circulatory problems. The reports focus on the immediate on-field response and his transfer to hospital, with no additional confirmed details on the cause beyond the club’s description or on any timeline for recovery.

Overall, the accounts align on the key facts: Karetsas is removed in the first half, stretchered, taken to hospital, and the club attributes the incident to circulatory problems.