Dan Jones has suffered a setback in his return from his ankle injury, with the Spireites left-back now facing a longer stretch than expected on the sidelines.
The original ankle injury occurred in November in the game with Swindon Town, but now a secondary problem has surfaced that will keep Jones in a non-weightbearing boot for six weeks, at which point he will be able to start another spell of rehab.
Head of sports science and medicine, Rodger Wylde, explained the circumstances of the injury: "Dan has two screws in his ankle and the injury he sustained in late November has now healed, with the screws still in place.
"He progressed through the training with no real problems, until he got back to playing with the reserves and he started sprinting. He found he was getting some pain between the metatarsals in his foot, which in medical terms is a million miles away from his injured ankle.
"We investigated the problem and found the contributing factors. One was that the one of the screws was causing irritation that was then effecting the movement of the foot.
"To all intents and purposes the ankle is now healed, but now Dan is back in a boot for six weeks while he has the problematic screw removed from his ankle.
"Then he will restart his rehab again as we once again push towards a full return to fitness."