The move means the 27-year-old will now have spent three consecutive seasons away from Anfield after playing on loan at Beskitas for the past two years.
.@LorisKarius has completed a loan move to @fcunion for the duration of the 2020-21 season.
All the best for the rest of the campaign 🙌— Liverpool FC (@LFC) September 28, 2020
Karius has not made a competitive appearance for Liverpool since two mistakes proved costly in the 2018 Champions League final loss to Real Madrid.
The German joined Liverpool from Mainz in 2016 and is pleased to be returning to his homeland.
🤝 @LorisKarius signs in Köpenick on loan from @LFC.#fcunion https://t.co/qTDd4LvXS1
— 1. FC Union Berlin (@fcunion_en) September 28, 2020
Karius told the Bundesliga club’s website, fc-union-berlin.de: “I’m looking forward to my new opportunity in Berlin and I’m happy to be playing in the Bundesliga again.
“Union is a special club, one that has earned a great deal of respect, not just by promotion to the Bundesliga.
“I would like to play my part in this positive development and help to achieve the great goal of staying in the Bundesliga.”