Arsenal have completed their first major signing of the summer in Riccardo Calafiori but the Gunners will surely not stop there. Riccardo Calafiori completed his move to Arsenal earlier this week and the Italian defender is set to play a key role at the club under Mikel Arteta. However, this looks to be just the beginning for the Gunners this summer. Here is the latest news coming out of the Emirates Stadium. Mikel MerinoArsenal are interested in Real Sociedad’s Mikel Merino with the former Newcastle United midfielder keen to leave the La Liga side. According to Spanish outlet Sport, there is …