Prior to Saturday’s 3-0 win at Bournemouth, the Reds had not shut out an opponent since late September, but they made it two in three days at Salzburg on Tuesday night.
Having kept Jesse Marsch’s dangerous side at bay before the break at Red Bull Arena, Naby Keita and Mohamed Salah struck in the second half to guarantee top spot in Group E.
Post-match, Alisson detailed the shifts in performance that allowed the European champions to get back to their miserly best in defence.
“It was just a matter of time and of focus,” the goalkeeper told Liverpoolfc.