I think he's knock just before the International break is actually a blessing in disguise for Liverpool, if it's a minor one. He'd get to rest properly after several consecutive matches.
I couldn't find any official report by Liverpool though.
Alisson should be back for the next game too which is a big boost, hes been out with a calf injury since August. Adrian has done very little wrong in his absence but Alisson is one of the best GKs in the world, we are stronger with him.