Nacho Monreal was the latest Gunners defender to go down injured ahead of a packed Premier League schedule with a muscle strain against Burnley yesterday.
Hector Bellerin, Rob Holding, Konstantinos Mavropanos and Shkodran Mustafi are all out injured.
That means Laurent Koscielny may be forced to step up his return from injury at a quicker rate than hoped, having been out since the end of last season.
The France star has been in and out of the first-team in recent weeks but may be forced to play in both games in the coming days.
However, should Unai Emery opt to rest him, Ainsley Maitland-Niles and Sead Kolasinac could start in the wing-back spots.
Granit Xhaka could be forced into a makeshift back-three, along with Sokratis Papastathopoulos and Stephan Lichtsteiner, as he did after Monreal went off against Burnley.
Mohamed Elneny may replace Matteo Guendouzi – who's long-overdue a day off having played more than any other Arsenal player this season.
Elneny could start alongside Lucas Torreira – who's on four yellow cards for the season.
Mesut Ozil could also start as the more advanced player of a midfield midfield three after a strong showing in the 3-1 win over Burnley.
Alexandre Lacazette and Pierre-Emerick Aubameyang are likely to start up top, with forwards Danny Welbeck and Henrikh Mkhitaryan both crocked.
Meanwhile, Emile Smith-Rowe is another Arsenal absentee due to injury.
Arsenal take on Brighton on Boxing Day before travelling to Liverpool on Saturday December 29.
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