While Liverpool prepare to play Arsenal tomorrow night, Jurgen Klopp might be having a team-selection issue, with Alisson and Thiago facing late fitness tests.
The goalkeeper and newly signed midfielder have not been able to feature in the workouts at Melwood in preparation for the Anfield showdown, with the nature and extent of their issues still unknown.
The Reds will have a late session today and even if the pair is able to join the group for it, they will still require assessments on Monday before being considered for selection by Jurgen Klopp.
Alisson suffered hip and calf problems last season, rendering him unavailable for 14 matches.
Thiago has been in line to make his full debut after a hugely impressive cameo in the center of the park in the 2-0 victory over Chelsea at Stamford Bridge.
Alisson and Thiago pair were among several first-team regulars rested for the Carabao Cup third-round tie at Lincoln City on Thursday, which Liverpool won 7-2.
Should Alisson fail to be available, Adrian will continue in goal with Caoimhin Kelleher on the bench.