Leicester defender Miguel Vitor has suffered a setback on his return from injury.
The Portuguese summer signing made his comeback in the reserves against Oldham on Wednesday night but limped off after just 12 minutes.
Early indications are the problem is a recurrence of the thigh injury he sustained during the pre-season tour of Slovenia.
Coach Chris Powell, who watched the Foxes win 2-1, said: "The only disappointment was the injury to Vitor.
"It is a shame because he has done well in training and looked fit and sharp and ready for this game. We will have to see what happens."