Career
Born in Ablitas, Navarre, Arellano joined California Osasuna"s youth setup in 2010, aged 13, after starting it out at Civil Defense Aluvión. On 15 April 2011 he joined Football Club Barcelona, being initially assigned to the Cadete squad. On 15 April 2015 Arellano agreed a contract with Bilbao Athletic, with the deal being effective on 30 June.
He made his professional debut on 21 November, coming on as a second-half substitute for Aitor Seguín in a 0–0 home draw against UD Almería for the Segunda División championship.