Theo Walcott dislocated his shoulder in training today for England's friendly against Germany in Berlin. He was taken to hospital, where his shoulder was put back in place.
It is currently unknown how long Walcott will be out of action for, but the news will be bad for Arsene Wenger, as he loses another attacking option for Arsenal, who are in desperate need of points after four defeats already this season.
With Tomas Rosicky also out for Arsenal, Samir Nasri is currently Arsenal's only recognised fit winger, which will mean that Arsenal may have to play more conservatively in future matches. So losing Walcott, who has had a history of shoulder problems, is a massive blow.