MUST BE PERFECT: Arsene Wenger's side can't afford any mistakes against Chelsea [GETTY] “They mustn't make mistakes. Chelsea are the most ruthless team in the league - they capitalise on other teams' mistakes” Jamie Carragher "That will be very important from Arsenal's point of view. "Chelsea rarely make mistakes themselves. Defensively they're always very strong, always very solid. "You just can't afford to switch off at any time against this Chelsea team because they punish you. "At times we've seen Arsenal do that, but I'm sure Wenger and the Arsenal squad are going to be really focused and concentrated on that game. "That will be the big thing,...
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