Millers physio Denis Circuit said: “"ustin will be back in full training in four weeks but it was better to have the surgery done now rather than later."
Defender Colin Murdock has stepped up his traoining from a groin problem, and should be fit for the start of the season next weekend.
Circuit added: "Murdock had two or three problems around the groin area, one has been treated already so hopefully he will start running this weekend when we can see how he is."