Former Liverpool defender Stephen Warnock says there is a "lack of belief" at times within the current Reds squad.
Arne Slot's side lost 1-0 to Galatasaray for the second time this season, leaving a deficit to overturn in next week's last 16 second leg at Anfield.
"They were too powerful for Liverpool, too strong, too direct," Warnock told BBC Radio 5 Live's Football Daily podcast.
"They were physically too strong and if Liverpool play like that at Anfield, Galatasaray will fancy their chances. So, there's got to be a change in the way that Liverpool approach the game.
"The quality wasn't there at all but we know at Anfield it's a different beast and a different atmosphere completely.
"The fans will be right behind their team and, like Galatasaray tonight, the players will be galvanised and pushing to get over the line.
"There's a mentality problem at the club at the moment, meaning once they go a goal behind the fingers start getting pointed and they start blaming each other.
"There isn't a collective togetherness to go and get that result and put things right.
"You've got to be more clinical, especially away from home. I thought the Inter Milan win would be the turning point of their season when they were well-organised but ever since then it's been up and down and the toss of a coin as to what Liverpool is going to show up.
"There's definitely problems within the team right now. There's a lack of belief at times, a lack of understanding of what's being asked of them. Some players want to play compact and organised and some want to play open, expansive football.
"You've got to find that balance that allows you to attack and defend as a team."
Listen to the full episode on BBC Sounds
