Zirbes is an aggressive center who dominates in the paint with an impressive combination of strength and technique. An energetic player and an excellent rebounder, Zirbes fights hard on every possession at both ends of the court. He was named to the German All Stars three years in a row (2012-2014), and has won the German League championship and the German Supercup (2013). In addition, Zirbes has won the Serbian championship (2015, 2016), the Serbian Cup (2015), and the Adriatic League championship (twice – 2015 and 2016).