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Arsenal looks much stronger at the back than it did last season. Laurent Koscielny has blossomed into a great defender. His partnership with Thomas Vermaelen has been a welcomed change in defense.
Wojciech Szczesny has also returned confidence to Gooners with some fantastic goal-keeping displays. Arsenal's defensive problems have mainly been in the full-back positions.
During the summer transfer window, Arsene Wenger opted to sell Gael Clichy and Emmanuel Eboue. Clichy had been a fixture at left-back for the Gunners since the 2006-2007 season.
In Emmanuel Eboue, Wenger sold his most qualified right-back behind Bacary Sagna. To replace the departed full-backs, Wenger brought in Andre Santos and Carl Jenkinson.
Santos was brought in from Turkish Champions Fenerbahce to replace Clichy. In his time at the Emirates, Santos has put in some interesting performances.
The Brazilian is a fantastic standing-tackler. He makes gut-busting runs down the left flank and loves to attack the opponent's box. At the same time, he has the tendency be caught out of position, which has been cause for concern.
Carl Jenkinson was signed from Charlton Athletic after making just nine appearances for Charlton in the span of six months.
Jenkinson has shown some promise, but injuries and a lack of experience have led to a rough start for 19-year-old.
Arsenal need to strengthen their defense. The Gunners have conceded 23 goals, which is the fifth most in the Premier League.