Koscielny on the other hand was able to make his injury comeback against Watford but the defender limped off during the closing minutes of the game sparking fears he'd aggravated an Achilles injury.
"Of course, we have discussions internally about the tough start, the fixtures, Europa League football but the position in the table is not where we need to stay and that is what we need to change".
Only Crystal Palace (29) have conceded more Premier League goals away from home than Arsenal (26 - level with Bournemouth) in 2017. Mathieu Debuchy is back in contention after making his first appearance of the season in the Europa League.
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He told Sky Sports: "Which Arsenal will turn up?" Or the team who turned up at Watford?
Ronald Koeman is a man under huge pressure and if results do not improve soon, he could be sacked in the near future. They could be in the bottom three after this.
This season brings new territory for Arsenal as Wenger outlined how he has essentially chose to operate with two separate teams - one in the league and one for the cups. "I made a decision to rotate at the start of the season and will continue to do so", he said before adding: "But the time will come when the rotation can go another way".
Koeman bought a lot of the same in the summer, and lost Romelu Lukaku.
"[It is not about] what will happen at the end of the season but what will happen on the pitch on Sunday and I think on the quality that we can produce".