The Frenchman was making his first start since tearing his Achilles in May, having been training with the first-team squad for around eight weeks, while Ozil has been out of action for over a month due to an ongoing back problem. The club also confirmed that Aaron Ramsey and Shkodran Mustafi are back in full training.
Emery is unsure about whether Koscielny will be able to handle the workload well enough to feature again against Southampton in the Premier League on Sunday and will wait to see how he copes with the visit of Qarabag.
However, finding a centre-back in the January transfer window might be hard, and Emery said the injury situation could force the club to examine whether Chambers can be recalled despite being sent on a season-long loan to Fulham in the summer.
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That could mean Koscielny will be asked to play twice in four days if he proves his fitness. We are going to look also if he can play 90 minutes or less minutes in this game.
"We are going to decide but the first is to think about the match tomorrow because we need to receive information on how he can feel tomorrow".
Arsenal won the reverse fixture against Qarabag 3-0 on matchday two, scoring with three of their four shots on target. The transfer [window] is not easy.Koscielny is coming back and for the team it's very important he is coming back.
Leigh Griffiths to take time away from football
Leigh Griffiths is taking an indefinite break from football to deal with what are believed to be gambling issues. Rodgers added: "He's reached a point where it's a struggle for him".
Qarabag have lost all five of their meetings with English sides in all competitions, by an aggregate score of 1-17.
It's the final group stage match of the Europa League season with the Gunners' place in the knockout stages already sealed.
Emery initially challenged teenager Eddie Nketiah to fill the void but the academy product has only started once since then and failed to shine in a Europa League win against Vorskla Poltava.
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Someone forgot to unload the heart before the plane left for Dallas, and the captain announced over Idaho they were turning back. It is unclear, however, what the heart was intended for or whether someone's life was on the line, the Times reports.