Michael Jordan has some fans worried he may be enjoying his European vacation a little too much. The NBA legend took in the UEFA Champions League match Thursday between AS Monaco and FC Barcelona at the Louis II Stadium in Monaco along with his wife, Yvette Prieto, though the 61-year-old’s yellow eyes raised concerns.

According to Healthline, "yellowing of the eyes typically happens if you have jaundice," which "occurs when the oxygen-carrying components in the blood, called hemoglobin, break down into bilirubin and your body doesn’t clear the bilirubin."

Michael Jordan was spotted in attendance at a Champions League match between AS Monaco and Barcelona, though fans quickly noticed that the basketball legend's eyes were a concerning shade of yellow