Ryan Shawcross admits he is not satisfied with his form this season and feels the Stoke backline needs to start tightening up.
The Potters, who host Fulham in the third round of the Carling Cup tomorrow, have made a mixed start to the 2010-11 campaign and are so far yet to keep a clean sheet.
Shawcross was involved in the failed attempt to clear a free-kick which led to West Ham's goal in the 1-1 draw at the Britannia Stadium on Saturday, and the 22-year-old insists it is time he and his defensive colleagues showed some improvement.
"I'm never happy - I want to be playing better every week," Shawcross said.
"At the moment, it is just about getting consistent and hopefully we can get a few more clean sheets.
"You could say we're not performing very well because we haven't got a clean sheet yet."