A plane carrying the patient -- a Senegalese epidemiologist who was infected in Sierra Leone -- touched down at the airport of the northern city of Hamburg and was to be taken to a hospital isolation ward.
A convoy of police and fire brigade vehicles was to guard the specially equipped ambulance on its way to the University Hospital Hamburg-Eppendorf, which specialises in treating contagious diseases.
A press conference was scheduled at the hospital for 1730 IST.
The lethal tropical virus which reemerged in west Africa early this year has since infected more than 2,600 people and killed 1,427.
Liberia has been worst hit with 624 registered deaths. Guinea, where the disease was first discovered, has reported 406 deaths, Sierra Leone 392 and Nigeria five, the WHO said on Friday.
The UN body said on Monday that more than 120 health workers across west Africa had died during the "unprecedented" outbreak, and more than 240 had been infected.