The Reds have acquired the veteran goalkeeper, who has 34 Austria caps, and he will provide competition for Simon Mignolet and Loris Karius under Jurgen Klopp at Anfield.
Liverpool has added to its goalkeeping options by signing Alex Manninger on a short-term deal.
The veteran goalkeeper had been invited to train with the Reds during preseason following his departure from Bundesliga side Augsburg.
Manninger - who has 34 Austria caps - has agreed a move to Anfield where he will provide competition for Simon Mignolet and Loris Karius.
It marks a return to the Premier League for the 39-year-old some 14 years after leaving Arsenal, and he enjoyed stints with the likes of Juventus, Udinese and Bologna in Serie A before joining Augsburg in 2012.