Arsene Wenger established a style of play at Arsenal over 22 years, the team committed to playing a type of football that was both entertaining and successful. But for all the lovely passing play, by the end of his tenure rival managers had sussed Arsenal out and left them trailing.

Such was his belief in the players and the way they combined, Wenger rarely adapted his approach to opponents and was undone on several occasions. This was his big weakness.

A change of strategy was welcomed and in came Unai Emery, a coach who identifies where opponents are most dangerous and changes his setup accordingly. Somewhat predictably there are plenty of dissenters, with former player Robin Van Persie arguing on BT Sport that he doesn't "see a philosophy".

"He's changing a lot. He's changing his tactics a lot and changing his playing style based on the opponent. You need to form a basis from your own strengths."

How Emery's teams tend to play

During his time at PSG and Sevilla, Emery preferred a 4-2-3-1 or 4-3-3 in teams which made use of transitions and played from the back. Having employed a 3-4-3 for most of last season - due largely to injuries to Rob Holding and Hector Bellerin - Emery has since reverted to his usual setup, using this second season in charge to put his stamp on an Arsenal in flux.