Osman told evertonfc.com: "That has been the story so far of our season. We've played reasonably well in games, created quite a few chances and not quite been able to turn that into a victory.
"We take positives. We've had two clean sheets in the last two games and we're the team on the front foot.
"But, ultimately, it's about winning games in this league and we haven't quite made that next step."
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