Arsenal’s pursuit of Mikel Merino is heating up. The Gunners started this summer’s transfer window really quietly. They barely did anything in June, but Edu Gaspar and Mikel Arteta have been very active since the turn of July. Arsenal have turned David Raya’s loan into a permanent deal. Riccardo Calafiori has also been brought in from Bologna on a long-term contract. The Premier League runners-up are focusing on their midfield now, and TBR Football exclusive revealed that Merino has emerged as Arsenal’s top target. Here’s an update on the situation. Arsenal target Mikel Merino’s agents called …