Arsene Wenger has revealed that Arsenal midfielder Jack Wilshere has not yet returned to training with the club.
Wilshere suffered an ankle injury in the 2-1 defeat to Manchester United at the Emirates Stadium in November and there were reports that the England international would feature against Monaco in the Champions League next Tuesday.
However it is unlikely that Wilshere will return to competitive action before the end of the month after Wenger's comments.
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Wenger told the official Arsenal website: "Jack is progressing well, he is not back in training yet."
There are also fears that Alex Oxlade-Chamberlain's hamstring injury, sustained in the 2-1 victory over Manchester United in the FA Cup, could rule him out for a month, meaning he would miss crucial games for Arsenal and England's Euro 2016 qualifier against Lithuania on March 27 and friendly against Italy four days later.
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"Chamberlain has a hamstring strain, the only thing we don't know is how bad it is because usually the scans are only done 48 hours after the accident," Wenger added. "That will be done [on Wednesday]."
There is better news on Mathieu Flamini however, with the Frenchman back in training. Wenger has admitted that he could be fit to play in Saturday's home game against West Ham.
The manager also insisted that the crucial European tie would not affect his selection for clash against the Hammers. The Gunners are engaged in a battle for third place, and sit four points behind champions Manchester City.
"We were at a high level of fatigue because we played against Monaco, Everton, QPR, Manchester United, all very physical games," said the Frenchman.
"I will have to test medically, physically, how the players are on Friday, and I will make my decision then. The big priority is of course West Ham."
Arsenal head to the south of France needing to score at least three goals in the Stade Louis II to progress to the quarter-final stage of the competition. They have been knocked out at the last 16 stage of Europe's elite competition in the past five seasons.
Monaco stunned the north Londoners when they won 3-1 in the capital three weeks ago. Wenger criticised his team after the tie, claiming they were guilty of 'suicidal defending'.
Arsenal fans: where will Jack Wilshere fit when he returns from injury?