A statement from Mr Buhari’s spokesman says the new spy chief, Yusuf Magaji Bichi, has experience in intelligence gathering, investigation, research analysis and conflict management.

The former head of the agency, Lawal Musa Daura, was sacked last month by Nigeria’s Vice-President Yemi Osinbajo, who served as acting president in Mr Buhari’s absence.

Mr Daura was a close ally of President Buhari.

The sacking followed a controversial blockade of the parliament by security operatives.

Since then a director in the agency, Mathew Seiyefa, has been heading the DSS as acting director-general.