Arsenal haven’t done that much business in the summer transfer window so far. Indeed, the Gunners have made just one major signing this summer in the shape of Riccardo Calafiori. However, there will be a fresh addition to the squad who will almost feel like a new signing. Jurrien Timber is back fit and ready after a year on the sidelines, and, speaking to Sky Sports, Mikel Arteta has been discussing the role Timber will play this season. Arteta says that Timber will be a key player, describing him as ‘unbelievable’. Interestingly, Arteta also hailed Timber’s impact off the pitch, claiming that…