Permanent incapacity of Governor or Deputy Governor
Section 189(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) The Governor or Deputy Governor of a State shall cease to hold office if (a) by a resolution passed by two-thirds majority of all members of the executive council of the State, it is declared that the Governor or Deputy Governor is incapable of discharging the functions of his office; and (b) the declaration in paragraph (a) of this subsection is verified, after such medical examination as may be necessary, by a medical panel established under subsection (4) of this section in its report to the speaker of the House of Assembly.
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 88–89. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections