However, it has not been his performances in front of the home support that have been open to question this season.
Since September 15, Mesut Ozil has been in the starting line-up for just two of Arsenal’s away games – a period during which, despite a series of niggling injuries and ongoing question-marks over his attitude to Emery’s disciplined style of football, he started in 10 out of 15 Arsenal’s home games.
He has shown Emery he can be a flat-track bully, able to unlock teams who arrive at the Emirates determined just to defend for their lives. 10 out of 10 wins in recent games – the majority featuring Ozil – is testament to that.
READ MORE: What Arsenal boss Emery did to show total disregard for Mesut Ozil – and how it’s changed
But Goodison Park on Sunday is a different prospect. Even under Arsene Wenger it was not considered a “Mesut Ozil sort of game”.
Incredibly, he has not played an away game in England outside of London and the south east since a defeat at Manchester City on November 2017.
So to consider him for selection, Emery will have to go against an unwritten policy that seems to have been in place for 17 months.
Perhaps, though, Ozil has deserved that reconsideration – although too many fans are blinded by the occasional flash to see some of the science Emery has at his disposal.
READ MORE: Arsenal pile the pressure on Tottenham with win over Newcastle
A high-tech performance team produces the data upon which the Arsenal manager bases his reasoning. The website whoscored.com is rudimentary by comparison, but is still analytical enough to reveal the truth behind Ozil’s contribution.
An algorithm which combines attacking, defensive and passing events into a single rating out of 10 scored only Alex Iwobi, Ainsley Maitland-Niles and Sead Kolasinac among the starters as below the contribution made by Ozil.
He does little defensively, leaves holes in Emery’s pressing game and often gives the ball away with fancy tricks that do not come off.
Sometimes, he is brilliant.