#4 Reiss Nelson (18 years old)
Reiss Nelson may be on loan currently, but Arsenal fans mustn't forget about him. He's absolutely killing it in Germany, so much so the Hoffenheim faithful won't want to let him go. He's proving that English players can make it abroad but he'll be excited to transcend his form back on to English soil.
Reiss Nelson is a wide player, known for his silky footwork on the flanks. However, in Germany, he has shown the ability to cut inside and test the goalkeeper. It's this kind of versatility within his game which will make him attractive to Emery, and he may be the answer for Arsenal.
Currently, Arsenal doesn't have wide players with the ability to do a winger's job. They have Mesut Ozil and Pierre-Emerick Aubemayang deploying the flanks, but we all know they'd rather be playing centrally. It'll be interesting to see if Nelson can fill this void upon his return.