3) Add Some More Steel To Midfield
Without Thomas Partey to break up play, it was too easy for Brentford to get on the ball last week. While Albert Sambi Lokonga has a bright future ahead of him, he may not be ready to play against a team of the calibre of Chelsea.
While some fans may scoff, Mohamed Elneny has shown before that he can come up with performances in big games (including against Chelsea in May), and his extra physicality could help the Gunners win possession and get a stranglehold in the match.