Ala. Code § 45-8A-23.092

To perform his or her duties during his or her temporary absence or temporary disability, the manager may designate by letter filed with the city clerk a qualified administrative officer of the city. In the event of failure of the manager to make such designation, the council may by resolution appoint a qualified administrative officer of the city to perform the duties of the manager until he or she shall return or his or her disability shall cease.