After his playing days ended, Solabarrieta embarked on a career as a coach. In 2016, he was appointed as manager of Athletic Bilbao's Cadete A youth team.[4] The following year, he moved to control the Juvenil A squad.[5]
Due to a combination of a disappointing campaign for the CD Basconiafarm team coached by Ander Alaña and Solabarrieta's good work with the youths, the two men swapped roles within the club's structure for 2018–19.[6] However, he was soon promoted again when Gaizka Garitano, coach of the reserve side, was selected to take the helm of the senior team in December 2018,[7] in turn leaving a vacancy at Athletic Bilbao B which Solabarrieta was nominated to fill.[8]