3. Mats Hummels
Arguably, Hummels is the best defender in the world at the moment. He is strong, powerful and most importantly, he can take charge of a defensive situation. That is something that Arsenal desperately need, especially after Tuesday’s performance. Wenger’s defence looked like they didn’t know what to do when Dortmund were putting them under pressure. That is when a player like Hummels could use his calm head and take charge of the situation. Again, the German international wouldn’t come cheap but to get the best the Gunners will need to spend some money.