As well as the Ozil conundrum, Emery faces a headache over his defensive selection with both Sokratis Papastathopoulos and Shkodran Mustafi suspended.
That means at least one full-back or midfielder could have to play in central defence, with left-back Nacho Monreal probably the most likely candidate.
If Koscielny can not start, Emery may have to field a central defensive pairing of Stephan Lichtsteiner and Nacho Monreal, two full-backs who have never started a game together in the Premier League.
The centre-back suffered an Achilles tendon injury towards the end of last season and only returned to the bench against Huddersfield last weekend.
"I think our beginning is good, but at the moment in the table we are fifth and our mind is focused on being in the first four positions".
"We went through the team and (head coach Unai Emery) called it out and I couldn't believe it, but I just had to get on with it".
"Also this player today, [Eddie] Nketiah, with us also [he gave] a good performance".
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The match against Qarabag was a largely meaningless affair as Arsenal had already clinched the group win and neither team had anything to play for.
"Now I'm curious how he fights back".
"I think after his injuries he is coming back with good work and on Thursday he played with a good performance", he said.
"We think yes [Ramsey will be available]".
"Every young player, we have the responsibility to give them chances, first to train with us and to be demanding with their performances", Emery began, as quoted by Arsenal's official website.
"I want to wait tomorrow and Saturday for how he will feel after this match, for if he will play or not on Sunday". "Three weeks ago we were playing in Kiev and it was the same, with Emile Smith Rowe and [Joe] Willock, they scored there. But for us it's also very important".