The Reds forward spent just over two years with the Austrian club before moving to the Premier League with Southampton in 2014.
Mane is now set to face his old team on the second matchday of Group E as Liverpool aim to register their first points after defeat in Naples last month.
The Senegal international joined Jürgen Klopp at a pre-match press conference on Tuesday – read a transcript of his chat with the media below…
On whether the Premier League title race or Liverpool’s Champions League defence is more important…
Good question.