The France international ruptured his Achilles tendon in Arsenal’s 1-0 semi-final loss at Atletico Madrid last week and such was the serious nature of the injury that he was immediately ruled out of next month’s World Cup in Russia.
Further scans and analysis confirmed the rupture and departing Gunners boss Wenger has confirmed the centre-half, who was planning on retiring from international duty following the tournament in Russia, won’t play for most of the rest of the year.
“Koscielny is devastated because he has surgery and that means he will be out for six months.
“You will not see him before certainly end of December now, beginning of December at best, in certainly his final year when he would play for the national team. He misses now the World Cup as well.
“We always try to be positive, you know, but overall you can only say and try to support people when they suffer because they suffer of course from a situation like that.
“What is unusual in his case is that he had a tendinopathy for a long time and usually they don’t go to rupture but in this case, that is a bit surprising in this case.
“When people always have inflamed tendons they don’t rupture but in his case I don’t know why.”