Everton boss Rafa Benitez says his defence will gradually improve this season.
Everton are currently being exposed at set-pieces and Benitez does not believe his players have quite mastered his zonal marking methods.
“If a player is coming and running against you, you have to react. We have to make sure we're attacking the ball, and we show some character when we have to challenge," he said.
“We're not doing that. It's not just the zonal marking, if it's man-to-man they block your defender and there could be a man free with more chances and more space.
“I think it's about how you defend, showing character and showing the aggression you have to show in these situations to defend a corner or whatever."
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