Some players are just plagued with bad luck, bad knees or just fall over a lot.
Teams have to go on of course, and that is the importance of squad depth.
Arsenal are notorious for having key injuries at important times with season being no different.
£42m signing Mesut Ozil has had a difficult time of late, and just when the German was looking back to his best after scoring against Everton in the FA Cup, he was out again.
But who is forgotten about, a replacement coming in to do a great job, or just because they're out for too long?
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