Mikel Arteta faces having to play David Luiz again after his midweek horror show against Man City due to a horde of injuries to his defensive stars.
The Arsenal boss watched on as Luiz dropped a clanger to gift Raheem Sterling a goal, before clumsily hauling down Riyad Mahrez for a penalty.
Luiz had only been thrown on 25 minutes earlier but trudged past Arteta and down the tunnel after receiving his marching orders for the foul.
The Gunners are back in action on Saturday away to relegation candidates Brighton, but Arteta is short for options in his back line.
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