 In Alajuelense, he was nicknamed "La Comadreja" (The Weasel), for his facial profile.He was on the team when it won regional titles such as the UNCAF Cup and the CONCACAF Champions' Cup.In the summer of 2006, Ruiz was signed by Gent in a four-year deal along with Randall Azofeifa from Deportivo Saprissa and Roy Myrie from Liga Deportiva Alajuelense.