Laurent Koscielny's World Cup participation could be in doubt after picking up a potentially serious injury in Arsenal's Europa League semi-final clash with Atletico Madrid. The France international went down off the ball in the eighth minute and immediately appeared to be in agony, holding his heel and beating the turf with his fist. It was quickly decided to withdraw him and he was helped on to a stretcher before being carried off and replaced by Calum Chambers, with Atletico players – including international team-mate Antoine Griezmann – among the concerned onlookers.  Koscielny would have expected to be in the World Cup squad for France, whose campaign begins against Australia...
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