A senior Thai police official said the post mortem exam showed no signs of foul play in the 52-year-old's death.
Warne, who is considered to be one of the greatest cricketers of all time, died of a suspected heart attack on Koh Samui island, where he was holidaying.
The Australian government is bringing his body back to Australia where he will be given a state funeral.
Warne was a larger-than-life figure whose fame transcended sport and he inspired generations of fans.
