The 20-year-old suffered the setback playing for the club's second string against VfB Fichte Bielefeld last weekend. The injury is a blow for the German youngster, who made three Bundesliga appearances last season as Ralf Rangnick's side claimed second place behind FC Bayern München.
Hoogland may now be unable to add to that statistic until the end of September, leaving him doubtful for Schalke's first two group games in the Champions League.
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