For all the exciting attacking players we have at our disposal, I am actually quite excited about how we will do defensively. Petr Cech will not only bring experience but a willingness to keep clean sheets. Hector Bellerin aside, we have plenty of experienced defenders at the back. Per Mertesacker and Laurent Koscielny have a wonderful partnership together and if those two can stay fit for 70%+ of the season then those two along with Cech behind them can provide a terrific spine for the team at the heart of the defence, not to mention the tenacious Coquelin or even further more experience in Arteta when called upon