Arsenal have been linked with several midfielders ahead of the next two transfer windows, but it is still somewhat unclear what kind of player is needed in the squad. Declan Rice has been a revelation since his club-record move from West Ham in the summer, but despite his outstanding performances, Arsenal have struggled in midfield at times. Douglas Luiz of Aston Villa and Amadou Onana of Everton have both been linked, but neither player looks set to join in the winter window, amid Arsenal’s financial fair play struggles. Where have Arsenal struggled in midfield?Granit Xhaka departed after an …