Kenan Kodro was Osasuna s hero as he secured a 1-0 win over Girona to rubber-stamp promotion to La Liga through the Segunda Division play-offs.
Kodro and Maikel Mesa had secured a 2-1 win in the first leg in Pamplona, before Osasuna finished the job on Saturday at Estadi Municipal de Montilivi.
Promotion to Spain s top division is Osasuna s seventh, and they have historically had a habit of bloodying the noses of La Liga s big boys.
In their 2013-14 relegation season, Barcelona and Real Madrid left El Sadar with just a point while eventual champions Atletico Madrid were sent packing with a 3-0 defeat.
Osasuna will join fellow new-boys Alaves and Leganes in La Liga next season the Segunda Division s top two teams.