As Mikel Arteta’s Arsenal side arrived in the United States for their pre-season tour, they did so without a new signing in their ranks. In that regard, it’s probably best not to count both Tommy Setford and Lucas Nygaard, two 18-year-olds recently signed for the academy sides. Otherwise, it seems as if Riccardo Calafiori will soon undergo his Arsenal medical – not in time for him to join the playing squad in the US. It’s been a slow summer so far for the Gunners, but it now seems as if Edu and his transfer team are ready to step things up a notch. And after securing a deal for Calafiori, Arse…