Arsenal are aiming to add a midfielder to their squad in the summer window, but it now appears that one of their main targets may no longer be available. Mikel Arteta is particularly keen on signing Real Sociedad midfielder Martin Zubimendi, to complete his dream trio alongside Declan Rice and Martin Odegaard. Jorginho signed a new contract as a squad option, but Thomas Partey could be allowed to leave given his injury problems over the last few years. With Rice excelling in a more advanced role, a defensive midfielder is now desired, and Zubimendi is seen as a player who can both play alongsi…