The Premier League champions had an offer accepted by Crystal Palace on deadline day on September 1, before the Eagles blocked the deal as they failed to find a replacement.
“That was a bad mistake,” Carragher told the Stick to Football podcast. “Liverpool are known as being really smart in the market, not overpaying and really good at selling. That could cost them. I think if Liverpool don’t sign a centre-back in January…”
Keane, also on the panel, then stated "they'd miss out on the Champions League", which Carragher agreed with.
Keane added: “They’ll regret that decision as well, Guehi in the summer, won’t they.
“That looks worse now, the more you look at it.”
