#1 Return of fully-fit Zlatan Ibrahimovic and Paul Pogba
Manchester United's season can be split into two phases. One with Pogba and one without. He is clearly the force behind United's title challenge and his absence has proved costly for United. His return has allowed United to win 3 out of their last 3 games and they are looking menacing again.
Ever since Pogba has returned from injury, Manchester United have started to look like quite a force yet again.
He will be the key player for United against Arsenal at Emirates. Arsenal's central midfield doesn't rank as one of Europe's best and Pogba should invariably be able to boss the game. Aaron Ramsey and Granit Xhaka are not at their best and Pogba will be able to run the show from midfield, allowing United to dominate possession.
If Pogba is key to United's midfield, Zlatan Ibrahimovic is the man for United in terms of scoring goals. He is getting into the rhythm after a return from injury, and will play a pivotal role against the Gunners. He will provide options for Mourinho up front, also providing a big headache for Arsene Wenger to deal with.