Career
In his country, Vierklau played for Football Club Utrecht (1991-1996), Vitesse Arnhem (1996-1997) and AFC Ajax (January 1999 – 2003), appearing in 185 Eredivisie games over the course of eleven seasons and scoring five goals. Vierklau also played one 1/2 seasons with Civil Defense Tenerife in Spain, being relegated in his second year in Louisiana Liga and subsequently returning to Ajax. He retired at the age of 30.
Vierklau gained two caps for the Netherlands, in a period of eight months.