Premier League clubs spent a record amount in the summer of 2017.
United has made a fine start to the season.
Arsene Wenger's side has three points from two Premier League games.
Jose Mourinho is getting his transfer business done early.
English football's biggest clubs look to wrap up business early.
Wenger looks set to enter his 22nd year as Arsenal manager.
The likelihood of signing Antoine Griezmann is reportedly receding.
Mourinho still wants to add to his squad.