Arsenal are now working towards tying three Hale End academy prospects down to new contracts before they become free agents. Arsenal are keen to keep their most talented youngsters at the club. However, breaking through from the Hale End academy system into Mikel Arteta’s first team squad is arguably harder than it has ever been. The standard at the top end of the Premier League table, where the Gunners are now competing for titles, is incredibly high, and the margin for error over the course of a campaign is vanishingly slim. Arsenal keen to keep Reuell Walters, Amario Cozier-Duberry, and Kar…