Former Liverpool star Danny Murphy believes Jurgen Klopp should move Joe Gomez to right-back for this week's clash with Ajax.
Trent Alexander-Arnold has struggled in the position so far this season.
And Murphy thinks Gomez could do a better job defensively.
"Liverpool have lost just twice this season and bounced back from the first defeat by beating Bournemouth 9-0," Murphy wrote in the Daily Mail.
"Ajax will be a harder test on Tuesday but they need the same attitude. Jurgen Klopp has talked about reinventing the team, which usually means a tactical switch or changing personnel.
"Maybe he'll think about switching Joe Gomez to right-back for a couple of games as he's a natural one-on-one defender."
On Alexander-Arnold, he added: "There are defensive lessons he has to learn. Coaches, staff and team-mates at Liverpool should be helping him.
"He has to look at his positional play and smell danger a bit quicker. He has been given free rein for a long time but he should protect himself better, even if it means sacrificing some forward runs.
"Liverpool have looked complacent this season but I don't mean players failing to give 100 per cent. It's more a lack of sharpness or failing to do the basics when you've not had any competition for your position.
"I sometimes slid into the comfort zone and needed a jolt. I'm not saying Trent is the same but the coaches at Liverpool could spend more time with him analysing the defensive parts of his game that need work. He is a good listener so his issues are easily resolved. Small details can make a big difference."