Speaking to Betfred, the England international said: "That has to be the foundation now. Every game, whether it is at Anfield away or [at Old Trafford], it always has to be the same and I think that is where we have been lacking I think is the consistency.
"I think one game we are excellent, for example, the game against Chelsea here - we played a really good game, then we go and let ourselves down by playing Bournemouth here and losing 3-0. It's not acceptable, we can't accept that and it's something that needs to be addressed and changed very quickly because we can't keep doing this."