Liverpool boss Brendan Rodgers says his side has been working extremely hard to improve the defensive aspect of the game.
The Reds are one of the three teams yet to concede a goal so far this season in the Premier League.
They join Manchester City and Manchester City who also kept three clean sheets in as many games.
And the Northern Irishman was full of praise for his team ahead of this weekend's game against West Ham United.
"We've put in extra work and extra focus on [defending], we're doing extra sessions in every aspect of our defending," Rodgers said on Friday.
"Both in terms of in the game from static positions, moving positions, and our set-pieces as well.
"We're putting in an awful lot of work into that organisation.
"I think it's one of the things I picked up on last season, we brought in a lot of new players into a system [and] we felt they were coming in with a profile [and] could maybe settle into it quickly.
"But the learning aspect from that was that we needed to do more on [the defensive] front this season and that's something we've done.
"The coaches have been outstanding in their support of that and the players are just making sure they're clear in terms of their role and responsibility, first and foremost without the ball, and then with the ball."