The 20-year-old centre-back initially moved to the Austrian Bundesliga club for the 2022-23 campaign in July of last year and made 15 appearances in all competitions.
Koumetio joined the Reds’ Academy in 2018 and has made two first-team appearances under Jürgen Klopp, with a debut coming in the Champions League encounter with FC Midtjylland in December 2020.