Jurgen Klopp has admitted concerns over his defensive options, with Virgil van Dijk and Joe Gomez the only senior centre backs now fit and available.
"Preseason, you can lose a game like this and it [doesn't mean] everything you did before was wrong and if you win 5-0 it [doesn't mean] everything was right".
'Joel, we'll have to see.
Klopp has still not signed a direct replacement for Coutinho and Adam Lallana continues to struggle with niggling injuries so Liverpool could do with adding another attacking midfielder to their squad.
Woods-Mickelson showdown set for Thanksgiving
The duo have been rivals for much of their careers, with Mickelson a long-time number two to Woods' domination as world No.1. Woods is a vice captain for 2018 captain Jim Furyk and is fighting for one of the four at-large picks.
He played in Brazil and Portugal, then was initially kept out of the Roma team by Wojciech Szczesny, who found English football hard at Arsenal.
The 25-year-old impressed on his pre-season bow against Napoli on Saturday, but Souness believes he still has plenty to prove if he is to be the answer in a problematic area for Liverpool.
"The league will be hard". "It is not about judging our situation and thinking "wow, really good".
"We need some time for everything to become natural, but we did something good, especially at 2-0". That is our challenge'.
Goalkeeper Alisson made his first appearance for the Reds following his £65 million move from Roma last month, playing the entire game at the Aviva Stadium.