Clough said the the injury was particularly cruel as Davies was looking sharp and ready for the new campaign.
"He has shown a terrific attitude and willingness to get himself right for the new season," Davies said.
"He was looking in terrific shape and we were delighted with how he was coming on.
"I have no doubt that if he applies himself to his rehabilitation like he has done over the last few months to get fit then he can bounce back from this and still play a big part in our season.
"Steven was a key element of our plans for the forthcoming season."
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