But it was Wenger who was in charge when the German World Cup victor signed that long-term deal last season, so if Ozil is in a comfort zone, then it's his former manager who must take a lot of the blame.
Ozil missed last week's Europa League last 32 first-leg defeat at BATE Borisov as he was still feeling the effects of a sickness bug. And where Arsenal's players' diet is monitored by an army of nutritionists, Bate's players were spotted enjoying a Burger King the morning after their first leg win.
He is quoted by The Telegraph as saying: "Firstly, the key is in his hands".
"He's been working very well this week".
But Emery is hopeful he can finally coax the best out of the World Cup victor, saying: 'I ask him in our conversations to be consistent, to be available for us in training.More news: Incredible pictures show unbelievable moment female passenger gives birth DURING a flight
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Attack: Another reason Emery may switch formation is he won't have Alexandre Lacazette available due to suspension after he was sent off last week so the boss won't be under pressure to play two strikers up front. "Now, this week is good for all the players, because we are in a big, important moment for the season and I look at him doing the training like we want".
"He must be available in training for matches, without injuries or being sick".
"It's a precaution. We'll know more tomorrow, but I hope he can be OK on Sunday or next week", said Emery.
The Gunners remain favourites to advance given the gap in quality between the two sides.
Ozil, 30, played the full 90 minutes for the first time since December.
The statement read: "We appreciate this kick-off time may present difficulties for supporters and matchday staff and we would have preferred for the match to kick-off at 8 pm, as has been the case for all our home matches in this season's group stage".