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London club will have to do without their main central defender Thomas Vermaelen, who suffered an ankle injury for a month.
The 25-year-old footballer got injured in the Champions League match against Udinese.
The Belgian national team player missed most of the last season due to an Achilles tendon injury. However, this and the current problems are not related.
A few days ago it was revealed that another important Arsenal player, midfielder Jack Wilshere, will also be unable to play for up to three months.
