Shkodran Mustafi’s naming cost Unai Emery dearly as the German was responsible for each and every goal Vrystal Palace scored in a stunning 3-1 win at the Emirates Stadium that could be the defining game in Arsenal's season.
Following the match Mustafi was heavily criticized by the Match of the Day pundit Martin Keowen.
On Christian Benteke's opener, he said: "Look, Mustafi completely switches off - it's schoolboy stuff it really is.
"Your work needs to be done training pitch, not during a game. It's too easy."
He moved on to Wilf Zaha's second and said: "He's out-muscled. His poor decision making is costing his team - key moment and individual errors.
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"Then he stands there. Just get back and defend!"
"Mustafi loses his man but Arsenal need to take ownership in key moments like that," the pundit said.
The 27-year-old flop was also slammed by fans - but not by his manager.
But when asked about Mustafi's performance, Emery said: "They have very good players. Secondly at set-pieces we didn't work and be strong like we are doing all season.
"We can speak to players usually and they can play very well, sometimes not play with due diligence, but I prefer to speak about consistency throughout the season.
"Every player is helping and playing with big performances but, today, defending against Benteke and Zaha you can suffer more.
"If today, we were better at set pieces maybe we could win this match. Also, we controlled the possession but they defended well. We didn't find the best situation to score."