Mikel Arteta has done an incredible job at Arsenal in recent years. The Spaniard has taken the Gunners from being Premier League pretenders to Champions League contenders in no time at all, and he’s done it by incorporating talented young players and recruiting cleverly. William Saliba has been at the heart of this Arsenal revolution over the past two years, but, at one point, the centre-back looked as though he would never get his chance at Arsenal. Indeed, it took over two years for Saliba to make his Arsenal debut after his £27m move to the Emirates Stadium, and, at one point, it appeared h…