Why Everton have particular cause for concern heading into this weekend.
Suddenly gone are the days when Manchester United returned from a tough European trip to face a rested, dangerous opponent like Everton.
The tables have been turned, and it is the Toffees who fly back from Russia to face a fresh United side at the weekend.
So manager Roberto Martinez will be hoping his weary players do not commit the type of errors which have plagued them so far this season.
Opta data shows Everton have made more errors leading to goals, than any other side in the Premier League this season.
|Error Lead To Goal|
Everton have conceded five goals in the top flight as a result of their own mistakes, and over a six game period, it's a highly worrying figure for a usually so organised side.
The Toffees sit 15th in the Premier League with only one win to their name, but a victory will see them leapfrog United who are in seventh, but have only a two point advantage.