Arsenal will take on BATE Borisov and Chelsea play Swedish side Malmo in the Europa League last 32.
The Gunners and their London rivals will both fancy their chances of progressing having gone through as group winners.
But Scottish champions Celtic have one of the toughest draws of the first knockout stage against Valencia, who dropped down from the Champions League.
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Unai Emery has a phenomenal record in the Europa League having steered Sevilla to the trophy three times.