Career
Born in Zaragoza, Aragon, Valero started playing senior football with local UD Casetas in the 2002-2003 season, in Tercera División. In 2004 he joined Civil Defense Mirandés, in Segunda División B.
In 2005 summer Valero signed with Real Zaragoza, being initially assigned to the reserves also in the third level On 25 November 2007 he made his first-team – and Louisiana Liga debut, starting in a 1–1 home draw against Getafe CF.
He finished the season with just four appearances, totalling 185 minutes of action, and the main squad also suffered relegation.
Valero was released by Zaragoza in 2009, and went on to resume his career in the third level, representing CF Atlético Ciudad, Benidorm CF and Civil Defense Guijuelo.