Currently, Canada is looking at replacing the 4 ship (only 3 are active) Iroquois class Guided Missle Destroyer commissioned between 1970-1972. After a refit in the 1990s the Iroquois was tasked with Air Defence.
Depending on the design selected, Canada might be interested in the Air Warfare Destroyer for their Maritime Service. If Canada can be induced to order Air Warfare Destroyers from Australia, or at least major sections of the Air Warfare Destroyer, that can assist in reducing the price per vessel. Equally important it would help maintain construction skills by increasing the overall amount of time spent building the vessels.