 On 25 November 2007 P. Osorno were crowned champions of the "Primera B 2007", after beating Municipal Iquique 4–0 at "Tierra de Campeones Stadium", and returned to the "Primera Division" for the 2008 season; losing the category that season and returning to the "Primera B", again.In 2010 the club were relegated to the semi-professional third tier Tercera División, after losing the match for the stay with Deportes Copiapó.In 2012 the club played at the new third level professional league, the Segunda División, from where they were expelled the same year due to financial reasons.