The youngster is out with an ankle injury sustained in the North London derby against Tottenham a week ago.
It is unclear how long he will be out for at present, with Arsene Wenger set to inform the media about his condition later on Tuesday.
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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.