Valdez is a veteran of 17 seasons of professional baseball, competing most recently for the Mexican League's Tabasco Olmecas in 2003. His professional baseball career began in 1983 when he signed as an undrafted free agent with the Padres. Valdez played parts of three Major League seasons with the Cleveland Indians (1990-91) and Arizona Diamondbacks (1998), finishing with a career record of 1-1 and a 2.91 ERA. His most recent coaching experience came as a pitching coach at the Dominican Academy for the Japanese League's Tokyo Carp.
Quiñones and Valdez join holdovers Jose Mateo (hitting coach) and Victor Marmolejos (Athletic Trainer) for the 2006 campaign.