Former Arsenal fan-favourite Kieran Tierney is currently on loan at Real Sociedad, and his future plans are far from clear. The left-back moved to the Basque side in the summer after losing his place to Oleksandr Zinchenko, and whilst he has impressed at times, his consistent injury problems followed him from North London to Northern Spain. The 26-year-old was once a key player under Mikel Arteta, and was a very popular figure amongst the fanbase, but he lost his place after Zinchenko joined and raised the level of the role required at left-back, as a defender who inverts into midfield. The Sc…