The Senior Special Assistant to the President on Media and Publicity, Garba Shehu announced this on Friday.
He said both appointments were effective from May 29, 2019.
See his tweet:
President Muhammadu Buhari has approved the re-appointment of Mr Boss Mustapha as Secretary to the Government of the Federation (SGF), and Malam Abba Kyari as Chief of Staff (COS) to the President.
Both appointments take effect from May 29, 2019.— Garba Shehu (@GarShehu) July 5, 2019