 In his country, he played for FC Utrecht, Vitesse Arnhem and AFC Ajax (March 1999 to June 2002), appearing in 185 Eredivisie matches over 11 seasons and scoring five goals; he won the double with the Amsterdam club in the 2001–02 campaign, but was already a fringe player at the time.Vierklau also played one and a half seasons with CD Tenerife in Spain, being relegated in his second year in La Liga and subsequently signing with Ajax.He retired at the age of 29.