Paris Cowan-Hall is set for a spell on the sidelines after straining the medial ligament in his left knee in training.
Scan results suggest the 23-year-old winger will be out of action for around three weeks.
Cowan-Hall is expected to miss the fixtures with Oxford United, Mansfield Town, Portsmouth and Bury.
Meanwhile, Dean Morgan will return to full training next week following a hamstring injury.