When the City Manager is absent from duty, or disabled, a qualified City administrative official shall be designated by the City Manager to exercise the powers and perform the duties of the City Manager during his absence or disability.  The City Manager shall file with the City Clerk a list, by name and title, of three (3) qualified City administrative officials to exercise such powers and perform such duties.  These City administrative officials shall be listed in the order by which each shall be designated to assume temporarily the City Manager's duties.  During such absence or disability, the Council may revoke such designation at any time and appoint another City administrative official to serve until the City Manager shall return or disability shall cease.