However, specialists advised Perch should try to resume training and the former academy player could now be back in first-team contention before the end of November.
"He has come on leaps and bounds. He has made tremendous progress. He has been training again for close to two weeks and, so far, has not had any reaction," said boss Billy Davies. "He is not back in full training yet but he has been able to join in with a lot. He is still weeks and weeks away with regards to match fitness and games under his belt, but it is good to see him back involved."
The Scot added: "Just a couple of weeks ago we thought we were looking at January at least before he was back at this stage. Then, the specialist said we might as well just get him back into training and see how he got on.
"He was a little achy the first few times he trained but recently he has been able to train without pain so, fingers crossed, he will be okay."