Wirtz had grown up in a family that refused to compromise his development, nor that of his sister Juliane, who plays for Werder Bremen. His father Hans remains the chairman of Grun-Weiss Brauweiler, Wirtz's childhood was framed around the local football team. He grew up with a ball attached to his feet.

The 31-year-old is entering into the final year of his contract; Robertson has been at Liverpool since 2017; Milos Kerkez has been strongly linked to Liverpool from Bournemouth