In Salzburg, Dinamo Zagreb battled out a heroic 2-1 win in extra-time to go through on a tight 3-2 aggregate.
The first leg in Zagreb was a 1-1 draw. Valentino Lazaro gave Salzburg the lead Wednesday with an early strike, only for Zagreb's Junior Fernandes to force extra-time by making it 1-1 with just three minutes of normal time left.
El-Arbi Hilal Soudani won the game for Zagreb with a crucial strike five minutes into extra-time.
The draw for the Group Stages takes place in Monaco on Thursday.