Barton told talkSPORT: “I was surprised when I saw Liverpool's starting line-up. You've beaten Arsenal 4-0 at home and then you change your backline by taking [Dejan] Lovren out and putting [Ragnar] Klavan in.
"Klavan has not set the world alight as a Liverpool player and, when you're going to the Etihad, you want your back four to be confident and connected and know where each other is. But after the sending off after they didn't seem to have any relation to each other, they were all over the joint.
“I don't think they'd have won with 11 men, the way City were playing it would have been a tough afternoon for them, but you've got to be worried about how Liverpool defend."