By Sean Walsh Arsenal are closing in on the signing of Mikel Merino from Real Sociedad, according to a report. The Gunners have been scouring the market for a new midfielder this summer and have ramped up efforts to strengthen in that area in recent days. 90min first revealed last week that after Riccardo Calafiori’s arrival from Bologna was confirmed, Arsenal would step up their interest in Merino. Fabrizio Romano now reports that there is an ‘agreement in place’ between Arsenal and Merino in regards to personal terms, with just a transfer fee left to be sorted. Real Sociedad are hoping to se…