"It was a lesson in the second-half. We stopped doing the right things from a defensive point of view and as a team it was a shambles," said the Liverpool captain.
"This definitely brings us back down to earth with a bang. We need to get things sorted out and we need to go back to basics. Hopefully we'll do that and take it out on the Welsh and Irish in the next two qualifiers.
"People were switching off all over the pitch but you can't blame individuals. From front to back we stopped defending as a team and we all started playing individually. When you do that at this level you get punished.
"You can look for excuses all night but at the end of the day that second-half performance wasn't acceptable. We've let ourselves down, the fans down and the manager down. We need to put it right.
"Everyone wants to do well at the World Cup and the expectation is justified because it's about time we did deliver. But if we go into the World Cup playing like that we've got no chance."