City have slid down the Barclays Premier League into ninth spot since last month´s famous win at Old Trafford and Vassell is desperate for a reversal of recent fortunes heading into Sunday´s clash with Tottenham.
The striker, who grabbed the opener in their derby win over Manchester United, said: "There´s a lot of built-up frustration because we know we are a good team and we can compete against the best teams in this league."
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