LONDON — Arsenal welcome Chelsea to the Emirates Stadium in a big London derby as the title favorites and a recalibrated contender collide. Mikel Arteta and Xabi Alonso go way back, but their friendship will be put to one side for this clash as both teams aim to keep their 100 percent record to start the season.

This was so intriguing tactically as Arsenal edged past Chelsea in a fun London derby between bitter rivals.

But Napoli coach Massimiliano Allegri insisted he will stick with his favored 4-3-3 formation. "There will not be a change of system, absolutely not. I've only got four midfielders, so three of them will start tomorrow,