Arsenal defender Rob Holding has ruptured the ACL of his left knee and faces up to nine months on the sidelines, the Premier League club confirmed.
The Gunners centre-back, 23, was stretchered off in the 36th minute of their 2-2 draw with Manchester United on Wednesday evening and looks to have suffered a season-ending injury.
Holding will now undergo surgery to repair the damage and the rehabilitation process is expected to take six to nine months.
A club statement read: “Everyone at the club will now be working as hard as we can to ensure Rob is back on the pitch as soon as possible.”
Laurent Koscielny could fill the void left by Holding.
The former France defender, 33, has made two appearances for Arsenal’s Under-23s after recovering from a serious achilles injury.
Club captain Koscielny offers “experience, quality and personality” for the Gunners, according to Emery.
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He said: “The 18 can be for Saturday [against Huddersfield] and also we are doing one plan with him, maybe he can play against Qarabag [in the Europa League].
“He’s working with us every day in training and playing in the Under-23s with a good feeling. The next step, I think, is with us.”
Koscielny’s last competitive game for Arsenal came against Atletico Madrid in the Europa League semi-finals in May.