A second post-mortem has shown Cameroon midfielder Marc-Vivien Foe died of natural causes.
Foe was buried in Cameroon on Monday
The 28-year-old collapsed on the field during the Confederations Cup semi-final against Colombia at Lyon on 26 June.
He was treated on the pitch before being stretchered off and receiving further treatment, including mouth-to-mouth resuscitation and extra oxygen.
Medical staff tried to restart his heart for 45 minutes but without success.
An initial autopsy failed to determine the exact cause of death and the second
has ruled out the likelihood that he had any stimulants in his body.
"The death is from natural causes. No stimulant substances were found. The death was of cardiac origin," said public prosecutor Xavier Richaud.
"It is hypertrophic cardio myopathy. It is the hyper development of the left ventricle, which was noticed during the first autopsy."
Toxicology tests carried out as part of the autopsy were handed to an expert in Geneva for analysis before a definitive conclusion was reached, but the tests found that there was no trace of stimulants.
"As far as blood and urine are concerned, the negative toxicology shows that he did not taking any stimulants in the
72 hours before his death," Richaud added.
"An analysis of his hair shows that he did not take stimulants before (that time) or regularly."
Foe was buried in Cameroon's capital Yaounde on Monday, with more than 3,000 mourners paying tribute to the popular player.