Mikel Arteta faces a tough task in keeping everyone in his Arsenal squad happy this season. There is plenty of competition for places at Arsenal these days. Whilst that is overall a good thing, it does mean that there are certain to be frustrated individuals at the Emirates Stadium who miss out on game time throughout the season. Of course, there are nailed-on starters in Mikel Arteta’s ranks, too. If fit and available, the likes of David Raya, William Saliba, Declan Rice, Martin Odegaard, and Bukayo Saka are never going to be sidelined for any important matches. There are other positions that…