Everton boss David Moyes admits he has concerns over their defending.
Everton's tally of 26 goals conceded in 22 games is not bad but last weekend was their first clean sheet since September.
Moyes said: "We'd like to keep clean sheets because we need to try to start nicking a few games 1-0 if we have to. Who knows, it might be the second half of the season.
"We've tended to be a bit slow starters, we've actually started quite quickly this season but if we're looking to see what we could do better it would probably be have a few more clean sheets and hopefully that might come."