|Full name||Sergio Francisco Ramos|
|Date of birth||19 May 1979|
|Place of birth||Irun, Spain|
|Height||1.80 m (5 ft 11 in)|
|1997–2000||Real Sociedad B|
|2001||→ Eibar (loan)||16||(0)|
|2001–2002||→ Onda (loan)||36||(6)|
|2012–2013||Real Unión (assistant)|
|* Senior club appearances and goals counted for the domestic league only.
Born in Irun, Gipuzkoa, Sergio Francisco spent the vast majority of his 15-year senior career in the lower leagues, amassing Segunda División B totals of 246 games and 70 goals for four teams. He represented mainly local Real Unión.
Sergio Francisco's input at the professional level consisted of 51 games in Segunda División with SD Eibar, Gimnàstic de Tarragona and Real Unión, and four in La Liga with another Basque side, Real Sociedad. His debut in the latter competition took place on 17 September 2000, as he came on as a second-half substitute for Edgaras Jankauskas in a 1–4 away loss against Celta de Vigo.
Having suffered an anterior cruciate ligament injury in September 2008, Sergio Francisco retired at the end of the 2010–11 season, aged 32. He joined his main club's coaching staff the following year, under Imanol Idiakez, becoming head coach subsequently with Unión competing in the third level.
- "Al Celta le bastan cuatro minutos de locura" [Celta has enough with four minutes of madness]. El País (in Spanish). 18 September 2000. Retrieved 9 June 2016.
- "Sergio Francisco dice adiós a lo que queda de temporada" [Sergio Francisco says goodbye to rest of season]. Noticias de Gipuzkoa (in Spanish). 26 September 2008. Archived from the original on 26 August 2010. Retrieved 9 June 2016.
- "Sergio Francisco será el nuevo entrenador" [Sergio Francisco will be the new manager] (in Spanish). Real Unión. 12 July 2013. Retrieved 9 June 2016.
- "Sergio no continuará" [Sergio will not continue] (in Spanish). Real Unión. 5 June 2014. Retrieved 9 June 2016.