Discharge of functions of Governor
Section 191(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) Where any vacancy occurs in the circumstances mentioned in subsection (1) of this section during a period when the office of Deputy Governor of the State is also vacant, the Speaker of the House of Assembly of the State shall hold the office of Governor of the State for a period of not more than three months, during which there shall be an election of a new Governor of the State who shall hold office for the unexpired term of office of the last holder of the office.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 89. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections