Six hours of autopsy on Monday failed to produce an answer as to what caused the death of Livorno footballer Piermario Morosini, who collapsed and died during a match on Saturday.
Dr Cristian D'Ovidio said following the autopsy, more tests would be needed to find an exact cause of death.
"There is no evidence to the naked eye that allows us to determine what caused this lad's death," he said.
Morosini collapsed during Saturday's Serie B match at Pescara before being rushed to hospital, where he was later pronounced dead.
Read more: Channel News Asia
