Derry could be without a unionist mayor for the entirety of the current council term after positions are decided at its annual general meeting.
The council will meet on Monday to decide who will take over from the outgoing Mayor Sandra Duffy.
Derry has had a nationalist majority in local government since the 1970s but, thanks to the system of rotating the Mayorship between the parties, there have still been enough unionists elected to ensure multiple unionist mayors over recent decades.