Napoli striker, Victor Osimhen, had to be stretchered off the field during their 4-2 defeat at Atalanta on Sunday.
Osimhen collapsed in the final minute of the encounter after he fell awkwardly and hit his head on the pitch.
The 21-year-old appeared to lose consciousness and was taken into an ambulance.
Sky Italia reports: “It’s not clear what happened. He was down for a while, people thought he was injured, but then the players and staff started calling for oxygen.
“He was put onto the stretcher and rushed off the field into the ambulance.”
Napoli are yet to issue an official statement on the incident.