Arsenal need a midfielder, Everton should consider Jordan Pickford, Manchester City should invest in Alex Sandro and West Ham should sign Jermain Defoe By Martin Laurence for WhoScored? , part of the Guardian Sport Network The fact Arsenal need reinforcements in central midfield every summer shows they have failed to rectify an issue that has been holding them back for some time. They have been linked with a move for RB Leipzig’s Naby Keïta on numerous occasions…