Liverpool legend Jamie Carragher admitted their defence is a "bit of a worry" after their 4-1 win over Norwich to start the Premier League season.
The Reds emerged as comfortable winners at Anfield but a second-half Teemu Pukki strike meant they were unable to claim a clean sheet.
The visitors caused some problems going forwards whilst goalkeeper Alisson was also withdrawn with a calf injury before the break.
Carragher felt Joel Matip was unfortunate to miss out as Joe Gomez was given the nod to start alongside Virgil van Dijk - and he says they must become a more solid side defensively as they were last season.
Carragher told Sky Sports : "The reason we are questioning it is because this was the team with the best defence last season and they almost looked like you couldn't get past them with Virgil van Dijk.
"I was a little bit surprised that Joel Matip missed out [against Norwich]. I do believe Joe Gomez is Liverpool's next best centre-back behind Van Dijk but the way Matip performed at the end of last season and in the Champions League final, I think he can feel hard done by.
"It's not just today against Norwich, and you can say maybe they have taken it easy, but you look at the Community Shield against Manchester City and also pre-season didn't go as well as you would have liked defensively.
"I am sure when Jurgen Klopp goes through the game tomorrow, he will think they need to be tighter. Van Dijk was not happy at times with different players dropping off and pushing on.
"It wasn't the solid backline that we saw so much last season. It will come back, but from Liverpool's point of view, you want it to come back quickly because you don't want to be looking like a team who starts to concede goals as that puts doubt throughout the side."
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