Daniel Guillén Ruiz
|Full name||Daniel Guillén Ruiz|
|Date of birth||1 October 1984|
|Place of birth||Plasencia, Spain|
|Height||1.76 m (5 ft 9 in)|
|Playing position||Left back|
|2004–2006||Real Madrid C|
|2006–2008||Real Madrid B||22||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 19 February 2017.
Born in Plasencia, Cáceres, Guillén was signed by Real Madrid from another club in the capital, amateurs Las Rozas CF, first representing Real Madrid C. In the 2006–07 season, he made his debuts for the B-team in the second division, playing in 17 games as the side was relegated; the following year, he contributed even less (only five matches).
- "Plantilla del equipo: R.M. Castilla temporada 2006–07" [Team squad: R.M. Castilla 2006–07 season] (in Spanish). Liga de Fútbol Profesional. Retrieved 21 June 2008.[dead link]