Liverpool legend Graeme Souness says the senior players will know standards have plummeted this season.
Souness was speaking on talkSPORT this morning.
“You'd start by saying they have a lot of fabulous players there, but a lot of them are not at it," the former Scotland international said.
“You can ask yourself why is that happening as [Klopp will] be using the same terminology when he speaks to them. The training will be the same, they'll be staying in the same hotels and they'll be repeating all the things that have brought them success.
“But they appear to be lacking the energy to play the brand of football they want to play. They want to be in your face, have those midfield bullies that are constantly on the front foot. That is missing is something they need to address.
“I go back to that Napoli game, the first game of the Champions League, and they were just so far off it. And they haven't really got any better since then."
The former Liverpool skipper then continued, saying: “Confidence comes from within. It comes from winning games. If you're a big player, you don't need to be told when you playing well or not.
“These are players who are lucky to be at such a big club, but who are way short right now. They need to take a look at themselves. It's still in there somewhere and they are still a very good team. And you don't become a bad team overnight. But I will accept they are a country-mile being off where they've been over the last five or six years."