Defender Kieran Tierney is currently on loan at Real Sociedad from Arsenal, and his future is unclear. Tierney left last summer after losing his place to Oleksandr Zinchenko, and with Takehiro Tomiyasu, Jakub Kiwior and Jurrien Timber ahead of him in the pecking order, he has since admitted that he is likely to leave permanently. The Scotland star initially started well at his new home in Northern Spain, but injuries have continued to derail his progress. The 26-year-old was a huge talent when he joined Arsenal from Celtic, much like fellow Scot Charlie Nicholas back in the 1980s, and having q…