The Turkey centre-back will leave the club on July 1 following the expiry of his loan from Schalke 04.
Kabak made 13 appearances for the Reds after joining in February, helping Jürgen Klopp's side finish third in the Premier League and reach the quarter-finals of the Champions League.
Read the 21-year-old's farewell letter in full below.
Everyone at Liverpool FC thanks Ozan for his contribution to the club and wishes him all the best for the future.
Dear Liverpool family,
I would like to thank you for the compassion and support you have shown towards me since the day I arrived.