Arsenal midfielder Jack Wilshere says he has undergone ankle surgery and expects to be sidelined until December.

The 19-year-old England international sustained the injury in June and hasn't played since it flared up again in a preseason game against the New York Red Bulls.

Wilshere wrote on Twitter on Monday: ''Had my operation and all went well! I am feeling good will spend the night in hospital to monitor me but apart from that I am happy!''

On Friday, Wilshere tweeted he hoped to be back ''around Christmas time.''