Initially, Fünfstück worked at VfB Pößneck having ended his playing career due to injury.

In July 2002, he left VfB Pößneck to join SpVgg Greuther Fürth as the youth team manager.

He took charge of the youth team once more in 2010 and remained in this post until June 2011, when he once again moved upwards to become the new manager of SpVgg Greuther Fürth II.

Fünfstück left Greuther Fürth to join 1.FC Kaiserslautern, where he would become their reserve team manager and head of youth development.

When Kosta Runjaic left the club in September 2015, Fünfstück was announced the new first team manager.