This week could reveal a lot about what is realistic for Chelsea this season. In the next seven days, both Barcelona and Arsenal visit Stamford Bridge for games which will either showcase their ability to go head-to-head with the best in the world or highlight the flaws of a team which are still a work in progress.

A hat-trick by Eberechi Eze earned Arsenal more bragging rights over Tottenham and sent them six points clear at the top of the Premier League with a 4-1 victory on Sunday. Defeats for title rivals Liverpool and Manchester City on Saturday had opened the door for Mikel Arteta’s leaders to increase their advantage at the summit.