Xiker Ozerinjauregi Mendikoetxea (born 30 January 1997), known as Xiker, is a Spanish professional footballer who plays as a central defender for Amorebieta. Xiker began his footballing career in 2007 when he joined the academy of Athletic Bilbao. He progressed through the club's youth and reserve sides over the course of the next nine years before going on to spend a season at each of Segunda División B clubs Toledo and Peña Sport, after which he joined Real Sociedad B in 2018. He then enjoyed brief spells with Cornellà, Real Betis B, Sabadell, Ebro and Logroñés, before signing for Amorebieta in 2022.