Phil Thompson feels Liverpool’s failure to strengthen their defence during the summer was exposed by Manchester City’s 5-0 thrashing on Saturday.
The Reds lost their shape after Sadio Mane was sent off in the 37th minute while trailing 1-0.
Liverpool had recorded successive clean sheets before the international break.
“I still think we could have strengthened, without a doubt,” Thompson said. “We did sign Andrew Robertson, but he didn’t play against City or Arsenal, so yes we should have signed somebody.
“But for me, the selection was the big issue. After such an impressive result there is no reason to make changes because it’s such an important thing for a defence being settled, especially against such an offensive team when you’ve got to trust your team-mates.
“Lovren was on the bench and I always think if you are on the bench then you should be fit enough to play, so I can’t understand why Klavan played.
“Alexander-Arnold is a fantastic offensive player but even Klopp has questioned his defensive work, so I was expecting the same back four with Gomez in there.”
Liverpool’s legend felt the team reacted poorly to Mane’s dismissal and should have worked harder.
Phil added: “We should not get beat 5-0, 10 men or not. I thought we gave in and gave up and no Liverpool team should be like that.
“I thought there wasn’t enough grit and determination from the team as a whole. I would actually take Simon Mignolet out of that because none of the goals were his fault.
“I know people talked about the way City coped against Everton but it’s always harder with 10 men when you’re away from home.
“However, if you are organized and disciplined then you can still make it extremely hard for the other team and we didn’t do that.”