Arsenal have now confirmed the signing of Mikel Merino as their second signing of the summer transfer window. Mikel Arteta has been made to wait patiently for the next signing following the arrival of Riccardo Calafiori earlier in the summer. And Arsenal have finally got their man in Merino with the midfielder landing in north London from Real Sociedad. It was a move which left Sociedad frustrated over the weekend as Arsenal had taken their time to announce the Merino’s arrival. However, Arsenal fans can now relax as they have got their new midfielder over the line and he has already met up wi…