Zirbes started his career with the Gladiators from Treves, where he stayed until 2012, and then went to Brose Baskets, with whom he became the German National Champion.
Svojo košarkarsko pot je Zirbes začel pri Gladiatorjih iz Trevesa, kjer je ostal do leta 2012, nato pa prestopil v Brose Baskets, s katerim je leta 2013 postal tudi nemški državni prvak.