Arsenal have already got one senior signing over the line this summer, and now they’re looking to make a second acquisition. The Gunners left it somewhat late before making their first summer signing as they landed Riccardo Calafiori in late July. Now, Arsenal are determined to bring a new midfielder to the Emirates Stadium, and they’re pushing to sign one player in particular. The player in question is Real Sociedad and Spain star Mikel Merino, who has been impressive for club and country alike in recent years. David Ornstein of The Athletic has now published a new update on the state of play…