The 19-year-old has spent the past three-and-a-half years at Anfield since arriving from Orleans and previously spent four years in Lyon's academy between 2014 and 2018.
Koumetio has since become a regular for the Reds' Under-23 side, and he has also made two first-team appearances under Jurgen Klopp.
Koumetio came on for the second half of a Champions League game against FC Midtjylland in December 2020 and made his first senior start for the club in last season's EFL Cup quarter-final win over Leicester City.
The France Under-20 international will now be spending the next 12 months on loan in Austria to gain more first-team experience, and the 2021-22 campaign was a productive one for the defender at youth level.
Koumetio scored two goals and provided one assist in 24 Premier League 2 appearances and also played every minute as Liverpool's youngsters reached the quarter-finals of the UEFA Youth League.