Arsenal have announced that Kieran Tierney has joined LaLiga outfit Real Sociedad on a season-long loan deal. The Gunners confirmed the loan move on their website on Sunday. “Kieran Tierney has joined LaLiga side Real Sociedad on loan for the 2023/24 season,” Arsenal said. “Scotland international defender Kieran joined us in August 2019 from Celtic and during his time with us has made 124…