The Stoke City pig head stunt is the second prank at the club in a week.
On Sunday, striker Michael Owen tweeted pictures of his car pelted with eggs and flour.
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There "will not be a war again on the Korean Peninsula", South Korea's President Moon Jae-in has said.
Doug Bergeson, from Wisconsin, USA, calmly drove himself to hospital and walked into the emergency room to ask for help.
The venue will open its doors again for the first time since May's bombing on September 9 for the We Are Manchester concert .