 Liga club Sportfreunde Lotte on loan for the rest of the 2018–19 season.On 13 August 2019, Dietz joined Viktoria Köln on loan until the end of 2019–20 season.Dietz made 7 appearances for Germany U20, making his debut in a 1–0 loss against Italy U20 as a substitute on 1 September 2016.