Arsenal are set for a busy transfer window in both signings and sales, and some unpopular decisions may have to be made. Mikel Arteta’s side have challenged for the Premier League in back-to-back seasons, but they will now seek to upgrade their squad with the bit of extra quality they need to get over the line and win major trophies. This could mean some popular players depart, with goalkeeper Aaron Ramsdale set to leave after losing his place to David Raya, and Arteta now has a decision to make over his midfield. Arsenal have been linked with several midfielders including Bruno Guimaraes of N…