Arsenal captain Granit Xhaka clashed with his own supporters as Crystal Palace came from two goals down to earn a point in an ill-tempered atmosphere at Emirates Stadium.
The game turned toxic just after the hour when Xhaka was substituted to roars of delight from Arsenal's fans, the newly-appointed captain reacting angrily to jeers at his slow departure by waving and cupping his ear sarcastically to the home support, exchanging words before taking off his shirt and disappearing down the tunnel.
"He's wrong but we are going to speak inside about that situation," Gunners boss Unai Emery said.
The Arsenal boss added: "I want to be calm but, really, he was wrong in this action."
