Andrew Robertson says Liverpool let down their fans after a shock 3-1 defeat at Brentford on Monday night.
The Reds shipped three poor goals at the Community Stadium as Brentford ran out deserved winners.
"With the fans sitting at home or on the bus back up to Liverpool, it's not good enough for them," defender Robertson said.
"We've spoken about consistency and things like that but we're not getting it.
"It feels like we're one step forward and one step back at the moment which makes it hard to climb the league table unfortunately."
The Reds, who would have gone within a point of fourth with a win, have now dropped 23 points this season - one more than in the entire campaign last season.
Robertson continued: "First half we were second to every ball, no real runs in behind.
"We have to be first to the ball in the box, we have to be more aggressive in our own box, we have to prevent the corners in the first place and we didn't do that.
"We could have conceded three goals in the first half."
He added: "That performance [against Leicester] should have been a kick up the backside where we say 'right, we've won but now we need to put in a better performance'.
"Three days later we put in another bad performance. It's about consistency, we have to do it."