Danny Welbeck has undergone surgery on his left knee after being unable to sufficiently step up his rehabilitation work.
The striker has been working throughout the summer to recover from the injury sustained at the end of April.
It had been hoped he would avoid surgery but after increasing his training workload, the injury to his cartilage did not respond as well as hoped and the decision was taken last week for him to undergo surgery by a leading specialist in the field.
Danny is now expected to be out for a period of months and everyone at Arsenal wishes him well.
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