Büskens began his career with his hometown team Alemannia Düsseldorf, before he moved to city giants Fortuna. After five years, he moved to VfL Benrath, returning in 1987 to Fortuna, this time as member of the professional squad, and rarely missed one top division game during his three-year spell, although ended in relegation.
In January 2000, Büskens spent half a season at MSV Duisburg, returning to Schalke after a poor season. He continued to play for the team until 2003, splitting between the first and second squads in his last year, also being assistant manager of the latter.
Büskens remained in charge until the end of the season, being replaced by Dutch Fred Rutten in July. However, in March 2009, the latter was fired, which led to the pair again taking over the side until the end of the season (now accompanied by another former Schalke player, Oliver Reck), being then replaced by Felix Magath, and released by the club on 23 June 2009.