But he added: "Lagerback has now signed a five-month contract to take Nigeria to the World Cup."
Lagerback succeeds Shaibu Amodu as coach of the Super Eagles after they finished third at the African Nations Cup in Angola last month.
The Swede will watch Nigeria's friendly against DR Congo on Wednesday and will be based in Nigeria from next month until the World Cup.
Lagerback has huge experience of international coaching