Arsenal's Jack Wilshere has undergone successful surgery on his injured right ankle but could be out for four to five months.
Wilshere has been recovering from a stress fracture and Arsenal medical staff hoped the problem would heal itself with the help of a protective boot. However, the club confirmed late on Friday evening Wilshere's ankle failed to respond to the treatment and he would need surgery.
Having gone under the knife on Monday, he said on his Twitter account: ''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!''
It had been thought that he would be out until Christmas, but a statement on the Arsenal website read: ''The initial indications are that the surgery has been successful and Jack will now undergo a prolonged period of rehabilitation. It is envisaged that Jack's rehabilitation will take a period of four to five months.''
Wilshere added: ''I've had my operation this morning and all went well. My ankle is little bit sore, but I'm already looking forward to working hard to get fit and playing again.
''I would also just like to say thanks for the many messages of support I have received from you - the fantastic Arsenal supporters. See you all soon at the Emirates.''
The England midfielder has been troubled by his ankle throughout the summer, having sustained the original knock in the Euro 2012 qualifier between England and Switzerland in June, and then aggravating it in a pre-season game a month later.