In June 2016, Iruña signed an agreement with CA Osasuna to become its second reserve team during the next five seasons.[1] The Iruña team had to play at least one division below the main reserve team Osasuna B (Promesas), and neither reserve team could enter the Copa del Rey.
In the 2017–18 Tercera División season, Iruña finished 3rd which would normally permit entry to the promotion playoffs; however, Osasuna B were relegated from Segunda B, and due to the hierarchy rules, Iruña were instead demoted to the Primera Autonómica de Navarra for the coming campaign, bringing to an end a 15-year sequence of maintaining their status at the same level.[2]
In the summer of 2020, with Iruña having been unable to climb back up from the regional level, their affiliation with Osasuna was ended (though they would remain a local partner club) and a new arrangement was made with CD Subiza to act as the feeder to the professional club's B-team.[3]
Manuel Larumbe
