Preliminary results of an autopsy on the body of Davide Astori confirmed that the Fiorentina captain died of natural causes related to a heart issue.

Astori was found dead in his hotel room on Sunday morning ahead of Fiorentina's scheduled Serie A game with Udinese, at the age of 31.

An autopsy was ordered to discover whether anyone should be held responsible for his death, but Antonio De Nicolo, the chief prosecutor of Udine who had ordered the autopsy to rule out manslaughter, confirmed that it had been a "natural death" related to a slow resting heart rate.

"Based on the evidence of the autopsy examination, carried out on March 6, 2018, on the body of Davide Astori, with reference to the cause of death, this cause can be indicated as of a cardiac nature, most likely a bradyarrhythmia with pluri-visceral congestion and a pulmonary oedema," De Nicolo told RAI television.

De Nicolo had opened an investigations to see whether anyone could be found culpable in Astori's death, and said a full report could take another two months.

"For a definite diagnosis, more profound histological examinations are necessary," De Nicolo added. "From the preliminary results, it does not seem like there is any external causes other than that of a natural death, but prudently our advisers are telling us that we must wait for the result of histological examinations before making a definitive statement.