Trent Alexander-Arnold is confident Adrian can make up for the absence of the injured Alisson in goal for Liverpool.
The latter suffered a calf injury in Friday's 4-1 win over Norwich City, and he could face more than a month on the sidelines, per Dominic King of the Daily Mail:
Dominic KingInitial fears for Alisson Becker is that he will be out for 4-6 weeks. Indications that he has torn his calf. If lay-off is to longer end of the scale, he could miss first Champions League group game in September ud83dudd34
Adrian only joined the Reds on a free transfer from West Ham United on August 5, but Alexander-Arnold said he's ready to fill in, per the Evening Standard:
"[His experience] is the main thing, he knows what he is doing.