Arsenal are reportedly close to signing Real Sociedad star Mikel Merino as their second major addition this summer. MIkel Arteta and Edu Gaspar have made just one signing so far as Riccardo Calafiori joined from Bologna, but Merino is now closing in on a move. Arsenal and Real Sociedad have been in talks for weeks after Merino rejected interest from Atletico Madrid and Barcelona to join Arteta’s side, but the deal has dragged on as the two clubs tried to agree on a fee. Arsenal won their opening Premier League game against Wolves 2-0, but face a tough test in an away trip to Aston Villa, and t…