Castles has labelled Ruiz as an 'obvious fit' to Mikel Arteta's side thanks to his hardworking qualities. The Spaniard won the most possession at the Euros and twice as much as any other player in the final third of the field. Following the departure of Mohammed Elneny and the potential departures of Thomas Partey and Emile Smith Rowe, Arsenal will be looking to sign another midfielder and have also been linked with a move for Real Sociedad's Mikel Merino.