Paul Merson believes Jurgen Klopp has become "blinkered" at Liverpool - and needs to change formation if his side are to improve their wretched run of form.
The Reds are in crisis mode after losing six of their last seven Premier League games, and are in danger of missing out on European football next season.
They return to Champions League action on Wednesday for the second leg of their last-16 tie against RB Leipzig before taking on Wolves on Monday.
And speaking to Sky Sports Merson stated his belief that Klopp must change something quickly before things get even worse for his team.
"This is hard to say but I think Jurgen Klopp has been a bit blinkered at Liverpool," Merson said.
"It really is hard to say because he is a really top manager, but when you look at their situation, you've got Robertson and Alexander-Arnold, who are two of the best attacking full-backs in the country and they are up there as two of the best in the world too. There is no doubt about that. You only have to look at their assists and their crossing.
"But, at the moment, they haven't got the personnel in defence to keep things tight. If Van Dijk and Gomez aren't there, Liverpool's centre-backs aren't good enough. That screams at me that they needed to switch to a back three.
"That would give you bit more protection and it would just change things up a bit. However, he stuck with 4-3-3 time and time again, and they've been exposed."
Merson thinks Klopp needs to do a bit of soul searching, and worries that the German can be too stubborn in his tactical approach.
"The manager needs to take a look at himself and ask if he should've made a change?" he continued. "It doesn't matter if you don't believe in something like three at the back or never used it throughout your career because that's not the point.
"He needed to protect the players and try and get results. You can't just keep putting the same team out in the same formation and say: 'We are Liverpool. I've got three forwards who are going to score goals for fun like they have over the last year or two years.'
"They haven't done that, so you have to change and tighten up at the back. I can't emphasise it enough, he could have easily gone with three at the back to stop this rot and give them protection.
"I just can't see why he hasn't done it."
Liverpool are 2-0 up from the first leg against Leipzig, and Champions League glory would be their only hope of salvaging something from what has been a truly wretched campaign.
