Dortmund initially stated that Karetsas was experiencing problems with blood circulation, but the club later confirmed that he was in good condition given the circumstances. VoetbalPrimeur reports that further investigation at the hospital has revealed that the 18-year-old midfielder was suffering from dehydration. This diagnosis appears to be the reason behind Karetsas' sudden collapse on the pitch during the match. The Greek international was stretchered off the field at the Signal Iduna Park, sparking concern among fans and staff. Fortunately, it seems that Karetsas is expected to make a full recovery.