 On 19 May 2013, as the Basque side were already in the play-offs, he made his first team debut, coming on as a substitute in a 3–1 win at CD Izarra.On 4 January 2014 Galilea made his debut as a professional, again from the bench in a 2–0 success at CD Numancia for the Segunda División championship.On 20 August he was definitely promoted to the main squad, and renewed his link until 2017 on 2 September.