Per Mertesacker left Arsenal at a sharp disadvantage in Sunday's derby clash with Chelsea after he was shown a straight red card after 20 minutes for hauling down Blues striker Diego Costa.
The Germany international was given his marching orders, and Bleacher Report's Chelsea correspondent Garry Hayes felt it was deserved punishment considering the offence:
Mertesacker off here for hacking down Costa who looked to be through on goal. Never a dull moment when #CFC face #AFC. Definite red, too.
— Garry Hayes (@garryhayes) January 24, 2016
It's the second time in as many meetings between these two teams that Arsenal have finished without 11 men.