Cissé was transferred from Niamey, Niger, for specialised treatment in France.
Browsing: Soumaila Cisse
The decision clears the way for Keita to be inaugurated next month for a second five-year term, at a time when Malian authorities are contending with rising violence by jihadist groups and ethnic militia.
Cisse lost the election to President Ibrahim Boubacar Keita, but on Friday said he had actually won and claimed the vote had been rigged.
The victory hands Keita a second term in the mostly desert West African country where militant violence and claims of fraud by the opposition marred the poll.