Arsenal defender Kieran Tierney spent the season on loan at La Liga side Real Sociedad, but his future is now far from clear. Tierney has admitted that he enjoyed his time at Real Sociedad in the Basque Country, but whilst he did impress at times, his injury problems continued, scuppering his chances of succeeding in his fresh start. Mikel Arteta already has four other left-backs at his disposal at Arsenal, and could be set to sign another as Jorrel Hato and Ferdi Kadioglu have been linked. It seems certain that Tierney will end up departing Arsenal this summer, but what is not certain is wher…