The former Hoops defender has been linked with a departure from North London all summer and it has finally went through with the Scotland star making the move to La Liga.
Rob Holding wished Kieran Tierney all the best at Real Sociedad as he gave a nod to Celtic in his good luck message.
Tierney had fallen well down the pecking order at the Gunners under Mikel Arteta with the club sanctioning a move away to get regular first team minutes under his belt. The temporary switch will come as a huge boost to both the player and national team boss Steve Clarke with the Dark Blues facing big games on the horizon with the quest to reach the Euros in Germany resuming in a couple of weeks.
Speaking to Real Sociedad TV about his switch, Tierney said: "My first impression is so good. Everyone I meet is so friendly. The city is so nice and the stadium is beautiful as well. It's a big change but something I'm looking forward to so much. It's an exciting challenge and I'm delighted to be here.
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