Liverpool defender Dejan Lovren says they can still improve, despite three consecutive clean sheets.
The 27-year-old believes the defensive unit are not yet functioning at their maximum level.
“For the confidence of everyone, for the goalkeeper, the defence, [the clean sheet] is great," he told Liverpoolfc.com after their EFL Cup win over Leeds United.
“I think Klavan and Lucas had a great game on Tuesday, both of them, especially with Alberto and Trent behind. These four are not playing together day by day so I think they had a good game.
“Of course, it's important to have a clean sheet but when you're in the Premier League it's really tough. I always prefer the three points.
“I think we're on 85 per cent. We're in good shape, everyone is doing well, but I think we can be better.
“As the season goes on further, hopefully until the end we can be still in the top four and maybe even in first place.
“We just need to work hard and keep our heads down and not to think about big things - go game by game, that's the best thing for us."