Career

Holtmann joined the reserve side of Eintracht Braunschweig in the Regionalliga Nord in 2014. On the 30th matchday of the 2014-2015 2. Bundesliga season, he made his professional debut for Eintracht"s senior side, in a match against Football Club Erzgebirge Aue.

On 7 October 2015, Holtmann made his debut for the German national U-20 team in a match against Turkey.