Arsenal duo Ethan Nwaneri and Reiss Nelson look sharp in pre-season training as Mikel Arteta gets his squad working again. Pre-season is now underway at Arsenal, with Mikel Arteta back out on the grass working with his squad. This is a crucial stage of the campaign, as the team need build up a foundation of fitness that will carry them through the season. This is also the best chance that the manager will get, without important matches coming thick and fast, to work on tactics and introduce new ideas to his team. Not all of Arteta’s players are now back at London Colney. A number of Arsenal st…