Arsenal are keen on signing a midfielder in the summer transfer window, with the limitations of their current options showing in recent weeks. Mikel Arteta found a winning formula as Jorginho became a starter alongside Declan Rice, but with the veteran’s future unclear, a midfielder who can play at the base of a trio could become a priority. Thomas Partey was an unused substitute against Aston Villa and Bayern Munich, and his injury struggles over the course of the season could mean he is up for sale in the summer. Rice has been outstanding since his arrival, but there has been a struggle at t…