With the scores locked at 1-1, the German defender failed to deal with a long ball in the Arsenal box allowing Wilfried Zaha to race through and score.
"He needs to improve things tactically, decision-making, but he has good quality and needs quality and my work is to help him," Emery told Sky Sports ahead of their crunch encounter with Wolves tonight.
"I am going to say to our supporters, 'Help our players.' We need to take the criticism and be strong as players, as a coach, as a team, as a club. We need to improve knowing that.
"Okay, we are receiving criticism after Sunday. It is normal. It is normal. The players know that.
"But we here need to be strong and okay we need improve and need to do this decision we need to take also this tactical approach for tomorrow."