3. As a signal of intent
Arsenal haven’t done it much in the past, it has become a common sight in football for a big club to make a big signing to let the world know what they are aiming for, and also to rubber stamp their name as one of the biggest clubs in the world. Arsenal did it over the summer with Mesut Ozil, but as good as the German is, he is still not enough for Arsenal to call themselves Champions League contenders. A new striker would see their stock rise, and would also see them move up the list of potential Champions League winners, no matter how hard it will be to get past Bayern Munich in the last 16.