Arsenal could be inching ever closer to making a big signing this week after some major developments took place over the weekend. The Gunners have been pressing on with their transfer plans and with the Euros now over and done with, there’s a chance for things to really move forward. As we know, Arsenal are looking to strengthen in a number of key areas, with a defender and a new central midfielder high on the agenda. Arsenal are keen on Mikel Merino for the middle of the park and could well sign the Spaniard before the window is done with. However, it is in defence where things have been maki…