Mikel Arteta’s side are in danger of throwing the Premier League title away following their defeat at the Etihad.
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Arsenal may not be at the summit for the first time since last October on Wednesday when Man City face relegation candidates Burnley.
Speaking on Sky Sports after the game, Viera praised Arsenal’s performance but admitted to questioning their mentality.
“I think Arsenal had a good performance but the difference between good teams and great teams, you can see that on the field. Those top players make the difference,” he said.
“Arsenal will feel more of the pressure now. I would question the mental strength of the team even more now.”