#1 Harry Maguire

This is the big one. Harry Maguire is one of the most sought after defenders in the Premier League. His consistency in the past couple of seasons at Leicester has made him one of the top defenders in the Premier League. He is a proven Premier League product with lots of experience and has definitely improved his overall game which makes him one of the best in the Premier League. No wonder all the clubs in the top six are vying for his signature.
If Arsenal win the race to sign him, it will be one of the major transfer coups of the window. Not only is he a great defender, but also a natural leader. It will be tough as Arsenal will have to go against the financial might of the Manchester clubs, but if they do sign him, it will go a long way in improving their shaky defence.