Champions League finalists Borussia Dortmund could now beat Arsenal to a target who Mikel Arteta was keen to bring to north London. Although Riccardo Calafiori is set to have a medical at Arsenal this week, Edu and his transfer team certainly won’t stop there, determined to improve Arteta’s options. This summer Arsenal have a relatively simple plan: sell players on the periphery of their squad and then find suitable upgrades. Arsenal are making an exception with Calafiori in that regard, given the Italian will sign for the club before the likes of Jakub Kiwior, Kieran Tierney or even Oleksandr…