Chelsea are usually rock-solid defensively. John Terry is good in the air, Ricardo Carvalho is wonderful on the deck and their midfielders are usually very well organised.
Against Barnsley in the FA Cup and against Spurs in the league in midweek Chelsea looked fragile. They have conceded four goals twice in the league this season and Manchester United have a much better goal difference.
Arsenal will look to exploit that uncertainty between defence and midfield and Chelsea's slight dip in confidence.
Chelsea are usually rock-solid defensively. John Terry is good in the air, Ricardo Carvalho is wonderful on the deck and their midfielders are usually very well organised. 
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