Liverpool were criticised for leaking goals earlier on in the season, but have now kept three consecutive clean sheets in all competitions.
Liverpool were 4-3 winners on the opening day of the season against Arsenal.
Moreno is targeting Europa League glory as well as a strong finish to the Premier League season.
The Liverpool midfielder was delighted to get the equaliser, but would like to see the defence tighten up.
There was plenty to take from Liverpool's 3-3 draw with Arsenal.
Liverpool kept another clean sheet in their win over Sunderland at the Stadium of Light.
Ball also thinks the defending as a whole needs to improve.
Everton have struggled to keep clean sheets this season.
Liverpool host Crystal Palace in the Premier League this weekend.
Betting on a 1-1 draw seems to be something of a banker when it comes to Liverpool.