"We've been working hard in training as a defensive unit," he said.
"We've been trying to get the right balance between attacking and defending so that when we lose the ball we're not too open.
"We did that well against Everton. We're all made up with the clean sheet and now we want to keep more of them."
Kelly is currently with the England Under-21 squad as they prepare for their Euro 2013 qualifiers against Iceland and Norway.
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