With Barcelona reportedly interested in Sead Kolasinac, per Mundo Deportivo, Emery could be set to lose a fundamental cog in his three-at-the-back system. It makes sense that Barcelona want a second-choice left-back to compete with Jordi Alba, but it makes absolutely zero sense for Arsenal to allow their 25-year-old flying wing-back to leave the club anytime soon considering the versatility the Bosnian offers. On the Chalkboard Emery has mostly opted to go with a 4-2-3-1 system this season, in which the starting back four usually includes Nacho Monreal at left-back in a flat four, with Kolasinac the second choice. However, the first we saw of Emery's brilliant tactical versatility came...
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