MANCHESTER, England, Dec 5 : Back-to-back Premier League wins have rejuvenated Manchester City's bid to catch up with leaders Arsenal, but a leaky defence has manager Pep Guardiola worried ahead of Saturday's home clash with Sunderland.

City beat Leeds United 3-2 last weekend before Tuesday's 5-4 win at Fulham, where Guardiola's men conceded three goals within 21 minutes after taking a four-goal lead.

"How many shots on target had Leeds? Three and they scored two. Fulham. Five? Six? So the average of what they shoot and we concede is high. We have to improve, of course we have to improve," Guardiola told reporters on Friday.

"All the goals were (from) the edge and we didn't have players there to defend. We will talk... I don't like to concede six goals in two games but we are the team w

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