 Ramba uchiverenga ndima ino - Guillén akaita mutambo wake wekutanga kuCosta Rica mumutambo waNovember 1991 wekushamwaridzana neUnited States uye akawana mari inosvika makumi maviri, pasina zvibodzwa. Akamirira nyika yake mumitambo miviri yekukodzera yeFIFA World Cup uye akatamba pa1997 UNCAF Nations Cup, 1998 CONCACAF Gold Cup uye 1997 Copa América. 