Serge ##ry impressed for Arsenal last season before suffering injury . Midfielder has been out for more than a year after with serious knee injury . he played 90 minutes for Arsenal reserve squad on Monday . Germany Under 21 international says he is feeling ' better and better ' again : Arsenal have doubts over future Liverpool star striker Sterling .
Serge Gnabry impressed for Arsenal last season before suffering injury . Midfielder has been out for more than a year after with serious knee injury . Gnabry played 90 minutes for Arsenal development squad on Monday . Germany Under 21 international says he is feeling 'better and better ' READ : Arsenal have doubts over signing Liverpool star Raheem Sterling .