"He can do what he wants — he stays on," Arsenal manager Arsene Wenger said. "He gets always away with it. It's quite honestly surprising."
Diego Costa's antagonistic ways spur Chelsea in triumph over Arsenal →
"You could say there was a lack of fight," Arsenal manager Arsene Wenger said. "It's a massive worry. We have to come back with much more personality and much stronger challenges."
Liverpool moves back on top, Arsenal sinks →