The Reds have lit up the Premier League on occasion this term with their frightening attacking play.
Mohamed Salah has been at the front of everything Liverpool have done offensively while notching 19 goals.
But it is at the other end of the pitch which Carragher fears Klopp’s side are most vulnerable.
And he thinks that the current centre-back partnership of Dejan Lovren and Joel Matip is too weak to permanently challenge for a top four place.
“It’s a big concern (Matip and Lovren don’t play enough), oh it’s massive concern,” Carragher told the Liverpool Echo.
“You always build any top team from your goalkeepers and your centre-backs.
“When me and Sami Hyypia played, we were fortunate as we never got injured and these two just get injured too much.
“Actually the stats aren’t too bad when they play together, the record is pretty decent.
“Liverpool need quality. Basically one of those two needs to be third choice.
“You need a centre-back to come in and one of those to play with him, and (Ragnar) Klavan is your number four.”
Liverpool would then need to bring in another centre-back and Carragher knows exactly which one fits the bill.
“We all know Van Dijk was the one [Klopp] wanted,” Carragher said.
“Because he never got another centre-back, Klopp, now he’s waiting until maybe January or the end of the season, I hope it’s January.”
