3 tactical alterations Emery must make against Chelsea

# Pit Alex Iwobi against Marcos Alonso

The match up between Iwobi and Alonso may prove vital

One of the success stories of Unai Emery's Arsenal era has been the performance of Nigerian international, Alex Iwobi. Although he still has to add more end product to his game, he has been exceptional in matches that haven't really gone towards Arsenal's favor as well.

On the other hand, Marcos Alonso is one of the best attacking left backs in the league. However, he is the weak link in Sarri's favored back four of Antonio Rudiger, David Luiz, César Azpilicueta and himself.

In his bid to join up with the attack, Alonso leaves acres of space in behind. When the ball breaks the way of the opposition, it is often left to David Luiz to come across if Alonso's wing is being attacked.

Alex Iwobi has been terrific this season in one-on-one situations against opposing full backs. Alonso is usually poor in such situations due to his lack of pace. He is also not helped by the inability of Chelsea's wingers to drop back in shape on time.

Spurs and Manchester United exploited Alonso's lack of awareness to devastating effect. Emery must ask Alex Iwobi to exploit this weakness in the Chelsea back line.