New signing Ebou Adams will be out for a couple of months after undergoing surgery on his shoulder, following a freak incident that saw him rip his pectoral muscle off the bone.
Adams, who was signed as a free agent from League Two title-winners Forest Green Rovers, lasted only 10 minutes in his debut outing against Cambridge United at the start of the summer.
He fell to the floor clutching his shoulder, with many suspecting it had been dislocated. However, Morison has revealed it is a far more damaging injury than that.
"He, amazingly, managed to rip his pec(toral muscle) off the bone! That’s normally a car-crash rugby type of injury, which is unbelievable.
"We thought he had done his shoulder, but it turns out his shoulder is perfect. He has had surgery on his shoulder, which means he will come back with 100 percent strength, so he will be a couple of months."
Elsewhere, Isaak Davies missed the majority of pre-season through injury, but Morison said he is still some way to playing in the Championship.
"He is back on the grass," he added of Davies. "He is at the point now where he owes us a pre-season. The same with Rubin, he just did his hamstring at the end of the Scotland trip. He owes us a pre-season and we can't fast track them because they are too important for the season."
Newly-appointed club captain Joe Ralls is fully fit heading into this weekend, having recovered from a slight niggle with a full week of training.
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