|Full name||Ferdinand Rudols Marcel Vierklau|
|Date of birth||1 April 1973|
|Place of birth||Bilthoven, Netherlands|
|Height||1.78 m (5 ft 10 in)|
|Playing position||Right back|
|* Senior club appearances and goals counted for the domestic league only|
Vierklau was born in Bilthoven, Utrecht. 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 earned two caps for the Netherlands, in a period of eight months. His debut was on 5 October 1996, as he played 71 minutes in a 3–1 away win against Wales for the 1998 FIFA World Cup qualification stages.