Prinzen is normally the U–23 coach for 1. FC Nürnberg.[2] He took over the U–23 team on 21 June 2013.[3] However, during the 2013–14 season, he took over on an interim basis on 7 October 2013 when Michael Wiesinger was sacked[4] and on 23 April 2014 when Gertjan Verbeek was sacked.[2]Rainer Zietsch took over the U–23 team on 19 October 2013 while Prinzen was coaching the first team.[5]Valérien Ismaël succeeded Prinzen on 5 June 2014.[6]