Jurgen Klopp said that Alisson was close to making his return to Liverpool's lineup after getting injured in the opening match of the season.
"One is Alisson's and the other is the medical department, which is more cautious. We have to wait and see. In training, he looks really well but it was a serious injury and we don't want to take any risks," said Klopp.
Klopp pointed to the Leicester City or Manchester United match as potential return dates.
Klopp also ruled out Joel Matip for their match against RB Salzburg.