|Full name||Sergio Mendigutxia Iglesias|
|Date of birth||12 June 1993|
|Place of birth||Avilés, Spain|
|Height||1.83 m (6 ft 0 in)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 28 February 2017 (UTC)|
Born in Avilés, Asturias, Mendi began playing as a senior with local CU Collado Villalba in the 2008–09 season, in Tercera División. In April 2009 he signed with Athletic Bilbao, returning to youth football. Mendi also appeared with the reserves in the 2010–11 season, in Segunda División B.
After appearing with Athletic's farm team in the 2011–12 season, Mendi suffered a syncope in early April 2012, being sidelined for the rest of the season. He rescinded his link with the Biscay side on 3 November, after failing to appear in 2012–13.
Mendi made his first-team debut on 30 November 2013, playing the entire second half and scoring his club's only of a 1–2 home loss against FC Barcelona B, for the Segunda División championship. On 11 July of the following year he joined another reserve team, Sporting de Gijón B.
- El Athletic de Bilbao ficha al cadete del CUC Villalba Sergio Mendiguchía, de 15 años (Athletic de Bilbao signs CUC Villalba's youth player Sergio Mendiguchía); El Faro del Guadarrama, 13 April 2009 (in Spanish)
- Un síncope aparta al jugador del Athletic Mendigutxia de la competición (A syncope set aside Athletic's player Mendigutxia from the competition); El Mundo, 3 April 2012 (in Spanish)
- Mendigutxia llega a un acuerdo para desvincularse del Athletic (Mendigutxia reaches agreement to dissociate from Athletic); El Mundo Deportivo, 3 November 2012 (in Spanish)
- Oficial: La Roda, firma Mendigutxia (Official: La Roda, Mendigutxia signs); Todo Mercado Web, 30 January 2013 (in Spanish)
- El filial contrata al delantero Mendiguchia (The reserve side signs forward Mendiguchia); Diario de Córdoba, 10 July 2013 (in Spanish)
- El Barça B coge aire ante un Córdoba negado en ataque (Barça B takes air against a Córdoba denied in attack); Marca, 30 November 2013 (in Spanish)
- Mendi, delantero del Córdoba, primer fichaje del filial (Mendi, forward of Córdoba, first signing of the reserves); La Nueva España, 11 July 2014 (in Spanish)
- El Athletic atropella al Sporting (Athletic runs over Sporting); Marca, 26 October 2015 (in Spanish)